1. Design and evaluation of information systems;Katter,1969
2. Retrieval parameters in growing data bases;Marcus;J. Am. Soc. Inform. Sci.,1972
3. Evaluative Research Principles and Practice in Public Service and Social Action Programs;Suchman,1967
4. Optimization of Retrieval Techniques and File Structures for the CIRCOL System;Scheffler,1974
5. On Purposeful Systems;Ackoff,1972