Symposium on Theoretical Approaches to Non Numerical Problem Solving, Case Western Reserve University, Ohio, Nov. 19-20, 1968 <br/><br/>
Theoretical approaches to non numerical problem solving  ; proceedings of the IV systems symposium / 

 - Berlin:  Springer-Verlag,  1970 
 - vi, 466p. 
 - Lecture notes in Operations Research & Mathematical System .
<br/><br/><label>Dewey Class. No.: </label>518.1  / Sy989.TA