Sable, J. D. "Use of semantic structure in information systems" pp40-42

[ACM] CACM 5(01) January 1962 (1962) [ACM] CACM 5(01) January 1962 "Design, Implementation and Application of IR-Oriented Languages," ACM Computer Language Committee on Information Retrieval on 20-21 October 1961 in Princeton, N. J.  

Languages mentioned IDL {1962} Information Description Language