Ergodic theory and related topics III proceedings of the international conference held in Gustrow, Germany, October 22-27, 1990 / U. Krengel, K. Richter, V. Warstat, eds. - Krengel, Ulrich, 1937-; Richter, K. (Karin), 1951-; Warstat, Volker (Lecture notes in mathematics (Springer-Verlag) ;, 1992)