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![Cover for Werner W. Wittmann · Produktionstheorie - Okonometrie und Unternehmensforschung. Econometrics and Operations Research (Paperback Book) [Softcover reprint of the original 1st ed. 1968 edition] (2012)](https://imusic.b-cdn.net/images/item/original/500/9783642879500.jpg?werner-w-wittmann-2012-produktionstheorie-okonometrie-und-unternehmensforschung-econometrics-and-operations-research-paperback-book&class=scaled&v=1660679326)
![Cover for Werner W. Wittmann · Evaluationsforschung - Lehr- und Forschungstexte Psychologie (Paperback Book) [German edition] (1985)](https://imusic.b-cdn.net/images/item/original/294/9783540155294.jpg?werner-w-wittmann-1985-evaluationsforschung-lehr-und-forschungstexte-psychologie-paperback-book&class=scaled&v=1421077486)