Faculty of Business Administration and Economics
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| Universität Bielefeld > Faculty of Business Administration and Economics > Innovation and Technology Management > Research |
Publications
2019
Michler O., Decker R., Stummer C. (2019) To trust or not to trust smart consumer products: A literature review of trust-building factors. Management Review Quarterly, forthcoming
Souka M., Böger D., Decker R., Stummer C., Wiemann A. (2019) Is more automation always better? An empirical study of customers' willingness to use autonomous vehicle functions. International Journal of Automotive Technology and Management, forthcoming
Backs S., Günther M., Stummer C. (2019) Stimulating academic patenting in a university ecosystem: An agent-based simulation approach. Journal of Technology Transfer, 44 (2), 434-461
Kaldewei M., Stummer C. (2019) How product intelligence and brand affect consumption value and intended usage: Evidence from a smart washing machine. In: Proceedings of the 48th EMAC Conference. European Marketing Academy (10 pages)
Haurand M.D., Stummer C. (2019) Fighting fair? Evaluating negative campaigning with an agent-based simulation. In: Operations Research Proceedings 2018. Springer, forthcoming
Meißner M., Haurand M.D., Stummer C. (2019) With a little help from my customers: The influence of customer empowerment on consumers' perceptions of well-established brands. In: Brem A., Tidd J., Daim T. (eds) Managing Innovation: Understanding and Motivating Crowds. World Scientific, 367-394 [Reprint of paper by Meißner et al., 2017, in the International Journal of Innovation Management]
2018
Kaldewei M., Stummer C. (2018) Der Einfluss der Produktintelligenz auf den Konsumentennutzen und die Produktnutzung. Schmalenbachs Zeitschrift für betriebswirtschaftliche Forschung, 70 (4), 315-349
Haurand M.D., Stummer C. (2018) Stakes or garlic? Studying the emergence of dominant designs through an agent-based model of a vampire economy. Central European Journal of Operations Research, 26 (2), 373-394
Stummer C., Kundisch D., Decker R. (2018) Platform launch strategies. Business & Information Systems Engineering, 60 (2), 167-173
Günther M., Klein M., Lüpke L. (2018) An agent-based simulation using conjoint data: The case of electric vehicles in Germany. In: Operations Research Proceedings 2017. Springer, 595-601
Haurand M.D., Stummer C. (2018) The early-stage development of two-sided digital platforms: A simulation approach. In: Proceedings of the European Conference on Information Systems (ECIS 2018). AIS Electronic Library, Research Paper 49 (15 pages)
Stummer C., Lüpke L., Backs S., Günther M. (2018) Agentenbasierte Marktsimulation — ein Spezialwerkzeug. In: Siebe A. (ed.) Die Zukunft vorausdenken und gestalten. Springer, 125-142
2017
Meißner M., Haurand M.D., Stummer C. (2017) With a little help from my customers: The influence of customer empowerment on consumers' perceptions of well-established brands. International Journal of Innovation Management, 21 (6), 1750048 (28 Seiten)
Dawid H., Decker R., Hermann T., Jahnke H., Klat W., König R., Stummer C. (2017) Management science in the era of smart consumer products: Challenges and research perspectives. Central European Journal of Operations Research, 25 (1), 203-230
Stummer C., Günther M. (2017) Szenario-Analyse trifft agentenbasierte Marktsimulation: Entscheidungsunterstützung bei der strategischen Technologieplanung. Zeitschrift für Technikfolgenabschätzung in Theorie und Praxis, 26 (3), 17-22
Decker R., Stummer C. (2017) Marketing management for consumer products in the era of the Internet of Things. Advances in Internet of Things, 7 (3), 47-70
Günther M., Stummer C. (2017) Simulating the diffusion of competing multi-generation technologies: An agent-based model and its application to the consumer computer market in Germany. In: Fink A., Fügenschuh A., Geiger M.J. (eds) Operations Research Proceedings 2016. Springer, 569-574
Günther M., Lüpke L., Stummer C. (2017) Cross-over between scenario analysis and agent-based market simulation for technology planning. In:Proceedings of PICMET '17: Technology Management for Interconnected World. Portland International Conference on Management of Engineering and Technology (PICMET), 1-9
2016
Backs, S. (2016) Akademische Patente als Mittel zum Wissens- und Technologietransfer zwischen Wissenschaft und Wirtschaft: Simulationsbasierte Managementunterstützung für Technologietransferzentren. Verlag Dr. Kovač, Hamburg.
Kiesling E., Ekelhart A., Grill B., Strauss C., Stummer C. (2016) Selecting security control portfolios: A multi-objective simulation-optimization approach. EURO Journal on Decision Processes, 4 (1-2), 85-117
Leitner M.-L., Strauss C., Stummer C. (2016) Web accessibility implementation in private sector organizations: Motivations and business impact. Universal Access in the Information Society, 15 (2), 249-260
Günther M. (2016) Diffusion of multiple technology generations: An agent-based simulation approach. In: Kocaoglu D.F., Anderson T.R., Daim T.U., Kozanoglu D.C., Niwa K., Perman G. (eds) Proceedings of PICMET '16: Technology Management for Social Innovation Portland International Conference on Management of Engineering and Technology (PICMET), 2931-2940
Klat W., Stummer C., Decker R. (2016) From web analytics to product analytics: The internet of things as a new data source for enterprise information systems. In: Tjoa AM., Xu L.D., Raffai M., Novak N.M. (eds) Proceedings of CONFENIS 2016: Research and Practical Issues of Enterprise Information Systems. Lecture Notes in Business Information Processing, Vol. 268. Springer, 145-155
2015
Stummer C., Kiesling E., Günther M., Vetschera R. (2015) Innovation diffusion of repeat purchase products in a competitive market: An agent-based simulation approach. European Journal of Operational Research, 245 (1), 157-167
Venghaus S.,Stummer C. (2015) Finding partners for complex system innovations through a trans-sectoral 'matchmaking platform'. Technology Analysis & Strategic Management, 27 (3), 334-359
Ekelhart A., Kiesling E., Grill B., Strauss C., Stummer C. (2015) Integrating attacker behavior in IT security analysis: A discrete-event simulation approach. Information Technology and Management, 16 (3), 221-233
Sonderegger-Wakolbinger L.M., Stummer C. (2015) An agent-based simulation of customer multi-channel choice behavior. Central European Journal of Operations Research, 23 (2), 459-477
Zsifkovits M., Günther M. (2015) Simulating resistances in innovation diffusion over multiple generations: an agent-based approach for fuel-cell vehicles. Central European Journal of Operations Research, 23 (2), 501-522
Backs S., Stummer C. (2015) Akademische Patente und ihre Auswirkungen auf Forschung, Lehre und Administration an Universitäten. Management Review Quarterly (Journal für Betriebswirtschaft), 65 (1), 35-68
Stummer C., Lüpke L., Günther M. (2015) Intelligente Produkte, Zukunftsszenarien und Agenten: Eine Marktsimulation zur Entscheidungsunterstützung bei der strategischen Technologieplanung. In: Gausemeier J. (ed.) Vorausschau und Technologieplanung, Tagungsband vom 11. Symposium für Vorausschau und Technologieplanung (SVT). HNI Verlagsschriftenreihe (Bd. 347), 449-470
Backs S., Günther M., Stummer C. (2015) Academic patenting meets agent-based simulation: Provisional results and research perspectives. In: Suominen A., Toivanen H., Nieminen M. (eds) Innovation Policies for Economic and Social Transitions: Developing Strategies for Knowledge, Practices and Organizations; Proceedings of the Conference of the European Forum for Studies of Policies for Research and Innovation (EU-SPRI 2015). VTT Technical Research Centre of Finland, 248-252
Kiesling E., Ekelhart A., Grill B., Stummer C., Strauss C. (2015) Multi-objective evolutionary optimization of computation-intensive simulations: The case of security control selection. In: Proceedings of the 11th Metaheuristics International Conference (MIC 2015), 1-3
Meißner M., Haurand M.D., Stummer C. (2015) Does empowering consumers backfire in the context of technology brands like Nokia? In: Proceedings of the 44th EMAC Conference. European Marketing Academy (EMAC), 1-7
2014
Stummer C., Günther M. (2014) Partizipative Lehr-/Lernformate für die universitäre Aus- und Weiterbildung am Beispiel des Innovations- und Technologiemanagements. In: Keuper F., Arnold H. (eds) Campus Transformation: Education, Qualification & Digitalization. Logos, 129-147
Klat W., Gerholz K.-H., Stummer C. (2014) From simulation games to smart learning systems. In: Kritz W.C., Eiselen T., Manahl W. (eds) The Shift from Teaching to Learning: Individual, Collective and Organizational Learning Through Gaming Simulation; Proceedings of the 45th Conference of the International Simulation and Gaming Association (ISAGA). Bertelsmann, 288-300
Kiesling E., Ekelhart A., Grill B., Stummer C., Strauss C. (2014) Evolving secure information systems through attack simulation. In: Proceedings of the Hawaii International Conference on System Sciences (HICSS-47). IEEE Computer Society, 4868-4877
Ekelhart A., Grill B., Kiesling E., Strauss C., Stummer C. (2014) Komplexe Systeme, heterogene Angreifer und vielfältige Abwehrmechanismen: Simulationsbasierte Entscheidungsunterstützung im IT-Sicherheitsmanagement. In: Katzenbeisser S., Lotz V., Weippl E. (eds) Proceedings of the GI-Meeting Sicherheit 2014: Sicherheit, Schutz und Zuverlässigkeit. GI-Edition Lecture Notes in Informatics (LNI), Vol. P-228, Gesellschaft für Informatik, 345-361
Günther M., Stummer C., Wakolbinger L.M., Wildpaner M. (2014) An agent-based simulation approach for the new product diffusion of a novel biomass fuel. In: Taylor S.J.E. (eds) Agent-based Modeling and Simulation. Palgrave, 61-77 [Reprint of paper by Günther et al., 2011, in the Journal of the Operational Research Society]
2013
Wakolbinger L.M., Stummer C., Günther M. (2013) Market introduction and diffusion of new products: Recent developments in agent-based modeling. International Journal of Innovation and Technology Management, 10 (5), 1-19
Bauer C., Strauss C., Stummer C., Trieb A. (2013) Context-aware services in cooperative value chains: A key player-centred approach. Scalable Computing: Practice and Experience, 14 (3), 139-153
Gettinger J., Kiesling E., Stummer C., Vetschera R. (2013) A comparison of representations for discrete multi-criteria decision problems. Decision Support Systems, 54 (2), 976-985
Wakolbinger L.M., Stummer C. (2013) Multi-channel management: An exploratory study of current practices. International Journal of Services, Economics and Management, 5 (1/2), 112-124
Kopetzky R., Günther M., Kryvinska N., Mladenow A., Strauss C., Stummer C. (2013) Strategic management of disruptive technologies: A practical framework in the context of voice services and of computing towards the cloud. International Journal of Grid and Utility Computing, 4 (1), 47-59
Kiesling E., Ekelhart A., Grill B., Strauss C., Stummer C. (2013) Simulation-based optimization of information security controls: An adversary-centric approach. In: Pasupathy R., Kim S.-H., Tolk A., Hill R., Kuhl M.E. (eds) Proceedings of the Winter Simulation Conference (WSC 2013). Omnipress, 2054-2065
Kiesling E., Ekelhart A., Grill B., Strauss C., Stummer C. (2013) Simulation-based optimization of IT security controls: Initial experiences with metaheuristic solution procedures. In: Fink A., Geiger M.J. (eds) Proceedings of the 14th EU/ME Workshop. 18-20
Stummer C., Günther M. (2013) Die Balanced Scorecard (BSC) im Innovationsmanagement. In: Keuper F., Hamidian K., Verwaayen E., Kalinowski T., Kraijo C. (eds) Digitalisierung und Innovation: Planung, Entstehung, Entwicklungsperspektiven. Springer, 471-484 [Reprint of paper by Stummer and Günther, 2011, in Business + Innovation]
Stummer C., Günther M., Backs S. (2013) A survey on academic patents at Austrian universities: Methodology and initial results, WP 2013-01, Chair of Innovation and Technology Management, Bielefeld University
2012
Stummer C., Gutjahr W.J., Denk M., Riedmann H., Froeschl K.A. (2012) Training on the project: A quantifying approach to competence development. Knowledge Management Research & Practice, 10 (1), 64-78
Kiesling E., Günther M., Stummer C., Wakolbinger L.M. (2012) Agent-based simulation of innovation diffusion: A review. Central European Journal of Operations Research, 20 (2), 183-230
Stummer C., Kiesling E. (2012) Simulating innovation adoption behavior: Lessons learned for modelers and programmers. In: Breitenecker F., Bruzzone A.G., Jimenez E., Longo F., Merkuryev Y., Sokolov B. (eds) Proceedings of the 24th European Modeling and Simulation Symposium (EMSS-2012), 90-96
Kiesling E., Strauss C., Stummer C. (2012) A multi-objective decision support framework for simulation-based security control selection. In: Proceedings of the 7th International Conference on Availability, Reliability and Security (ARES 2012), IEEE CPS, 454-462
2011
Stummer C., Günther M. (2011) Die Balanced Scorecard im Innovationsmanagement. Business + Innovation, 2 (4), 31-39
Günther M., Kiesling E., Stummer C. (2011) Game-based learning in technology management education: A novel business simulation. International Journal of Emerging Technologies in Learning, 6 (1), 20-25
Günther M., Stummer C., Wakolbinger L.M., Wildpaner M. (2011) An agent-based simulation approach for the new product diffusion of a novel biomass fuel. Journal of the Operational Research Society, 62 (1), 12-20
Kopetzky R., Stummer C., Kryvinska N., Günther M., Strauss C. (2011) Disruptive ICT service technologies: Recent developments and practical implications for strategic management. In: Xhafa F., Barolli L., Bessis N. (eds) Proceedings of the International Conference on Emerging Intelligent Data and Web Technologies (EIDWT-2011). IEEE CPS, 125-130
Kiesling E., Gettinger J., Stummer C., Vetschera R. (2011) An experimental comparison of two interactive visualization methods for multi-criteria portfolio selection. In: Salo A., Keisler J., Morton A. (eds) Portfolio Decision Analysis: Improved Methods for Resource Allocation (International Series in Operations Research & Management Science, Vol. 162). Springer, 187-209
The book was distinguished with the (INFORMS) "Decision Analysis Society Publication Award" as the top Decision Analysis publication of 2011.
2010
Stummer C., Günther M., Köck A.M. (2010) Grundzüge des Innovations- und Technologiemanagements. 3. Aufl., WUV, Vienna
Gutjahr W.J., Katzensteiner S., Reiter P., Stummer C., Denk M. (2010) Multi-objective decision analysis for competence-oriented project portfolio selection. European Journal of Operational Research, 205 (3), 670-679
Neubauer T., Stummer C. (2010) Interactive selection of Web services under multiple objectives. Information Technology and Management, 11 (1), 25-41
Günther M., Kiesling E., Stummer C. (2010) Game-based learning in technology management education. In: Proceedings of the International Engineering Education Conference (IEEE EDUCON 2010). IEEE Press, 191-196
Winner of the "Most Innovative Paper regarding Engineering Education Award" at the IEEE EDUCON 2010 conference.
Vetschera R., Gettinger J., Kiesling E., Stummer C. (2010) Visualization methods for multi-criteria portfolio selection: An empirical study. In: Supplemental Proceedings of the 15th IFIP WG 8.3 International Conference on Decision Support Systems (DSS 2010). 1-9
Wakolbinger L.M., Stummer C. (2010) An agent-based simulation of multi-channel choice behavior across the purchasing process. In: Beckmann S.C., Ringberg T., Ritter T. (eds) Proceedings of the 39th EMAC Conference. European Marketing Academy (EMAC), 1-7
Kiesling E., Günther M., Stummer C., Vetschera R., Wakolbinger L.M. (2010) A spatial simulation model for the diffusion of a novel biofuel on the Austrian market. In: Bargiela A., Azam-Ali S., Crowley D., Kerckhoffs E.J.H. (eds) Proceedings of the 24th European Conference on Modelling and Simulation (ECMS 2010). 41-49
Nominated for the "Best Paper Award" at the ECMS 2010 conference.
2009
Stummer C., Kiesling E., Gutjahr W.J. (2009) A multicriteria decision support system for competence-driven project portfolio selection. International Journal of Information Technology and Decision Making, 8 (2), 379-401
Strauss C., Stummer C., Bauer C., Trieb A. (2009) A networked ubiquitous computing environment for damage prevention: A decision support framework for the insurance sector. In: Proceedings of the International Workshop on Design, Optimization and Management of Heterogeneous Networked Systems (DOM-HetNetS´09). IEEE Computer Society Digital Library, 276-281
Kiesling E., Günther M., Stummer C., Wakolbinger L.M. (2009) An agent-based simulation model for the market diffusion of a second generation biofuel. In: Rossetti M., Hill R.R., Johansson B., Dunkin A., Ingalls R.G. (eds) Proceedings of the Winter Simulation Conference (WSC 2009). Omnipress, 1474-1481
Winner of the inaugural "Best Applied Paper Award" at the Winter Simulation Conference.
2008
Stummer C., Neubauer T. (2008) Interaktive Portfolioplanung im IT-Servicemanagement. HMD Praxis der Wirtschaftsinformatik, 45 (264), 48-55
Dörner K.F., Gutjahr W.J., Hartl R.F., Strauss C., Stummer C. (2008) Nature-inspired metaheuristics for multiobjective activity crashing. Omega, 36 (6), 1019-1037
Gutjahr W.J., Katzensteiner S., Reiter P., Stummer C., Denk M. (2008) Competence-driven project portfolio selection, scheduling and staff assignment. Central European Journal of Operations Research, 16 (3), 281-306
Weber M., Denk M., Oberecker K., Strauss C., Stummer C. (2008) Panel surveys go mobile. International Journal of Mobile Communications, 6 (1), 88-107
Neubauer T., Pichler J., Stummer C. (2008) A case study on the multicriteria selection of software components. In: Proceedings of the IEEE Asia-Pacific Services Computing Conference (APSCC 2008). IEEE Computer Society Digital Library, 1005-1012
2007
Fürnsinn S., Günther M., Stummer C. (2007) Adopting energy flow charts for the economic analysis of process innovations. Technovation, 27 (11), 693-703
Ballestero E., Günther M., Pla-Santamaria D., Stummer C. (2007) Portfolio selection under strict uncertainty: A multi-criteria methodology and its application to the Frankfurt and Vienna Stock Exchanges. European Journal of Operational Research, 181 (3), 1476-1487
Neubauer T., Stummer C. (2007) Interactive decision support for multiobjective COTS selection. In: Proceedings of the Hawaii International Conference on System Sciences (HICSS-40). IEEE Computer Society Digital Library, 1-7
Neubauer T., Stummer C. (2007) Interaktive Entscheidungsunterstützung für die Auswahl von Software-Komponenten bei mehrfachen Zielsetzungen. In: Oberweis A., Weinhardt C., Gimpel H., Koschmider A., Pankratius V., Schnizler B. (eds) eOrganisation: Service-, Prozess-, Market-Engineering (Proceedings of the 8th Internationale Tagung Wirtschaftsinformatik, Band 2). Universitätsverlag Karlsruhe, 255-269
Neubauer T., Stummer C. (2007) Extending business process management to determine efficient IT investments. In: Proceedings of the 2007 ACM Symposium on Applied Computing. ACM, 1250-1256
Reiter P., Gutjahr W.J., Katzensteiner S., Stummer C. (2007) Multi-objective stochastic project portfolio selection using metaheuristics. In: Proceedings of the 7th Metaheuristics International Conference. 1-3
2004 - 2006
Dörner K.F., Gutjahr W.J., Hartl R.F., Strauss C., Stummer C. (2006) Pareto ant colony optimization with ILP preprocessing in multiobjective project portfolio selection. European Journal of Operational Research, 171 (3), 830-841
Neubauer T., Stummer C., Weippl E. (2006) Workshop-based multiobjective security safeguard selection. In: Proceedings of the First International Conference on Availability, Reliability and Security (ARES'06). IEEE Computer Society Press, Los Alamitos, 366-373
Stummer C., Sun M. (2005) New multiobjective metaheuristic solution procedures for capital investment planning. Journal of Heuristics, 11 (3), 183-199
Stummer C., Sun M. (2005) A Tabu Search heuristic for R&D project portfolio selection. In: Proceedings of the 6th Metaheuristics International Conference. 847-852
Dörner K., Gutjahr W.J., Hartl R.F., Strauss C., Stummer C. (2004) Pareto Ant Colony Optimization: A metaheuristic approach to multiobjective portfolio selection. Annals of Operations Research, 131 (1-4), 79-99
Stummer C., Dörner K., Focke A., Heidenberger K. (2004) Determining location and size of medical departments in a hospital network: A multiobjective decision support approach. Health Care Management Science, 7 (1), 63-71
Pla-Santamaria D., Stummer C., Günther M., Ballestero E. (2004) Compromise-utility approach to portfolio selection: A case from an opportunity set on three European Exchanges. In: Antunes C.H., Dias L. (eds) Managing Uncertainty in Decision Support Models: Proceedings of the 15th Mini-EURO Conference MUDSM 2004. 1-7
2001 - 2003
Stummer C., Heidenberger K. (2003) Interactive R&D portfolio analysis with project interdependencies and time profiles of multiple objectives. IEEE Transactions on Engineering Management, 50 (2), 175-183
Heidenberger K., Schillinger A., Stummer C. (2003) Budgeting for research and development: A dynamic financial simulation approach. Socio-Economic Planning Sciences, 37 (1), 15-27
Focke A., Stummer C. (2003) Strategic technology planning in hospital management. OR Spectrum, 25 (2), 161-182
Stummer C., Vetschera R. (2003) Decentralized planning for multiobjective resource allocation and project selection. Central European Journal of Operations Research, 11 (3), 253-279
Stummer C. (2003) Zur Modellierung mehrfacher Zielsetzungen bei der F&E-Projektauswahl. In: Habenicht W., Scheubrein B., Scheubrein R. (eds) Multi-Criteria- und Fuzzy-Systeme in Theorie und Praxis. Gabler, 287-309
Stummer C., Günther M. (2002) Zum Einsatz betriebswirtschaftlicher Modelle bei der F&E-Projektauswahl. Die Betriebswirtschaft, 62 (3), 289-304
Strauss C., Stummer C. (2002) Multiobjective decision support in IT-risk management. International Journal of Information Technology and Decision Making , 1 (2), 251-268
Dörner K., Gutjahr W.J., Hartl R.F., Strauss C., Stummer C. (2002) Investitionsentscheidungen bei mehrfachen Zielsetzungen und künstliche Ameisen. In: Chamoni P., Leisten R., Martin A., Minnemann J., Stadtler H. (eds) Operations Research Proceedings 2001, Selected Papers of OR 2001. Springer, 355-362
Stummer C. (2001) Faire Gruppenentscheidungen in der Investitionsplanung. OR Spectrum, 23 (4), 431-443
Heidenberger K., Ristl W., Stummer C. (2001) Planung von Forschungs- und Entwicklungsinvestitionen im Unternehmensspiel. Journal of Management Control (Zeitschrift für Planung), 12 (2), 125-140
Stummer C., Heidenberger K. (2001) Interactive R&D portfolio selection considering multiple objectives, project interdependencies, and time: A three-phase approach. In: Kocaoglu D.F., Anderson T.R. (eds) Technology Management in the Knowledge Era, Selected Papers of the Portland International Conference on Management of Engineering and Technology (PICMET '01) . 423-428
Dörner K., Gutjahr W.J., Hartl R.F., Strauss C., Stummer C. (2001) Ant Colony Optimization in multiobjective portfolio selection. In: Proceedings of the 4th Metaheuristics International Conference. 243-248
1998 - 2000
Heidenberger K., Muthsam H.L., Stummer C. (2000) Budgetierungsansätze für Forschung und Entwicklung im Überblick. Zeitschrift für Betriebswirtschaft, 70 (9), 1005-1029
Schulz I., Stummer C. (2000) Zum Qualitätsverständnis in der angewandten Wirtschaftsforschung: Eine Befragung ausgewählter Anbieter, Auftraggeber und externer Beobachter in Österreich. Zeitschrift für Gemeinwirtschaft, 38 (5), 33-50
Stummer C. (2000) Ein interaktives Entscheidungsunterstützungssystem zur Portfolioauswahl bei mehrfachen Zielsetzungen. In: Wanka G. (ed.) Decision Theory and Optimization in Theory and Practice. Shaker, 129-149
Stummer C. (2000) A two-phase approach to group decision making in R&D project selection. In: Proceedings of the INFORMS-KORMS International Conference. 900-905
Heidenberger K., Stummer C. (1999) Research and development project selection and resource allocation: A review of quantitative modelling approaches. International Journal of Management Reviews, 1 (2), 197-224
Stummer C. (1998) Projektauswahl im betrieblichen F&E-Management. Gabler
