1. Syntax directed compiling;Cheatham;Proc. AFIPS (SJCC),1964
2. C.A. Cuadra: Annual Review of Information Science and Technology, Vols. 1–4 and 6 (Chapters on Automated Language Processing).
3. J.B. Fraser: On communicating with machines in natural language, Computer and Information Sciences, Vol. 2, pp. 315–335. (Edited by J.T. Tou).
4. MEDLARS : Report on the evaluation of its operating efficiency;Lancaster;Am. Docum.,1969
5. The SMART automatic document retrieval system—An illustration;Salton;Comm. ACM,1965