Don R. Swanson. Information retrieval: state of the art. In Walter F. Bauer, editor, Papers presented at the 1961 western joint IRE-AIEE-ACM computer conference, IRE-AIEE-ACM 1961 (Western), Los Angeles, California, USA, May 9-11, 1961. pages 239-246, ACM, 1961. [doi]
Abstract is missing.