Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	M. Bartschi, "An Overview of Information Retrieval Subjects," IEEE Computer, Vol. 18, No. 5, May 1985, pp. 67-84.
	2	G. Biswas, V. Subramanian, and J. Bezdek, "A knowledge based system approach to document retrieval," Proceedings of the Second Conference on Artificial Intelligence Applications, IEEE Computer Society Press, December 1985, pp. 455-460.
	3	Yih-Chen Wang , James Vandendorpe , Martha Evens, Relational thesauri in information retrieval, Journal of the American Society for Information Science, v.36 n.1, p.15-27, Jan. 1985
	4	H. P. Giger, Concept based retrieval in classical IR systems, Proceedings of the 11th annual international ACM SIGIR conference on Research and development in information retrieval, p.275-289, May 1988, Grenoble, France  [doi>10.1145/62437.62461]
	5	"The Japan Information Center of Science and Technology," JICST Thesaurus - English Version - Vol. 1, 1987.
	6	Young Whan Kim , Jin H. Kim, A model of knowledge based information retrieval with hierarchical concept, Journal of Documentation, v.46 n.2, p.113-136, Jun. 1990  [doi>10.1108/eb026857]
	7	I. Monarch and J. Carbonell, "CoalSORT: A knowledge-based interface," IEEE Ezpert, 1987, pp. 39-53.
	8	P~. Oddy, "Informa{ion retrieval through manmachine dialogue," Journal of Documentatzons Vol. 33, 1977, pp. 1-14.
	9	R. Rada and E. Bicknell, "Ranking documents with a thesaurus," Journal of the Amcrzcan Society for Informatzon sczenc~, Vol. 40, No. ,5, September 1989, PP. 304-310.
	10	Gerard Salton , Michael J. McGill, Introduction to Modern Information Retrieval, McGraw-Hill, Inc., New York, NY, 1986
	11	Jean E. Sammet , Anthony Ralston, The new (1982) Computing Reviews classification system—final version, Communications of the ACM, v.25 n.1, p.13-25, Jan. 1982  [doi>10.1145/358315.358322]
	12	Peretz Shoval, Principles, procedures and rules in an expert system for information retrieval, Information Processing and Management: an International Journal, v.21 n.6, p.475-487, Dec. 1985  [doi>10.1016/0306-4573(85)90002-0 ]
	13	Philip J. Smith , Steven J. Shute , Beb Galdes , Mark H. Chignell, Knowledge-based search tactics for an intelligent intermediary system, ACM Transactions on Information Systems (TOIS), v.7 n.3, p.246-270, July 1989  [doi>10.1145/65943.65947]
	14	R.M. Tong and D.G. Shapiro, "Experimental investigations of uncertainty in a rule-based system for information retrieval," International Journal of Man-Machine studies, Vol. 22, 1985, pp. 265-282.
	15	Y. Yoon, K. Choi, G. Kim, and D. Shin, "A Hybrid knowledge-based Approach to Information retrieval,'' The Euromicro Journal: M~croprocess~ng and Microprogramm~ng, Vol 35. 1992, pp. 329-336.

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