1. Relevance disagreements and unclear request forms
2. National Science Foundation, Study Conference on Evaluation of Document Searching Systems and Procedures (PB 166–905), Washington, D.C., 1965, pp. 8–10.
3. On the Utility of the Relevance Concept (SP-1595), System Development Corporation, Santa Monica, California, 1964, pp 4–6
4. SEMANTIC FACTORS, ROLE INDICATORS ET ALIA
5. The aslib-cranfield test of the western reserve university indexing system for metallurgical literature: A review of the final report