- Symposium on Operations Research, 1991 in Trier
- Workshop "Nichtlineare Systeme" at the University of
Osnabrück, December 1993
- Annual Meeting of the Schumpeter Association, 1994 in Münster
- Symposium "Cognition, Rationality, and Institutions"
of the Max-Planck-Institute for Research into Economic Systems,
1997 in Jena
- Conference "Decision Making in Theory and Practice" of
the Economic and Social Research Council, 1998 in Oxford.
- Annual Congress of the European Economic Association,
1998 in Berlin
- Annual Meeting of the Verein für Socialpolitik,
1998 in Rostock
- First Jena Workshop on Nonlinear
Dynamics and Complex Systems, 2000 in Jena
- Conference "Economic Growth: Driving Forces and Constraints" of
the Heräus-Stiftung, 2000 in Bad Honnef
- Annual Conference of the European Association for Reserach into
Industrial Economics (EARIE), 2002 in Madrid
- Conference "Complex behavior in economics: modelling, computing,
and mastering complexity Complexity 2003" - Second Workshop of
the Society for Computational Economics, Special Interest Group on
Economic Dynamics in Aix-en-Provence
- 8th Viennese Workshop on Optimal Control, Dynamic Games, and Non-linear
Dynamics, 2003 in Wien
- INFER Annual Conference 2004 -- Environmental Economics: Institutions, Competition,
Rationality, 2004 in Wuppertal (Keynote Lecture)
- "Open-Source-Tag 2005" in Hannover.
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