TY - JOUR A1 - Ozbekhan, H. T1 - Planning and Human Action T2 - Weiss, P. A. (Ed.): Hierarchically organized systems in theory and practise, New York (Hafner Publishing Company) 1971, pp. 123-230. Y1 - 1971 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/17661 ER -