Stochastic Control Theory and Stochastic Differential Systems Proceedings of a Workshop of the "Sonderforschungsbereich 72 der Deutschen Forschungsgemeinschaft an der Universität Bonn" which took place in January 1979 at Bad Honnef - Kohlmann, Michael 1947-; Vogel, Walter 1923-2017 (Springer, 1979)