In: Equilibrium and disequilibrium in economic theory : proceedings of a conference organized by the Institute for Advanced Studies, Vienna, Austria, July 3 - 5, 1974, Jg. 13, S. 53-66
In: Nonlinear dynamics in economics and social sciences: proceedings of the 2. Informal Workshop held at the Certosa di Pontignano, Siena, Italy, May 27 - 30, 1991, Jg. 399, S. 69-94