1. Spark-Jones, K. and Kay, M., (1976) Linguistics and Information Science in Natural Science, edited by Walker, Kalgren and Kay. ( Skriptor, Stockholm )
2. Belkin, N.J. (1977) The problem of “matching” in information retrieval, in Theory and Application of Information Research. Proceedings of the 2nd International Research.
3. Oddy, R.N. (1974) Reference Retrieval based on induced dynamic clustering. (PhD Thesis. University of Newcastle upon Tyne, UK).
4. Dunham, G.S., Pacak, M.G. and Pratt, A.W. Automatic Indexing of Pathology Data. J.AM. Soc.Inf.Sci. 1978; 29; 81–90.
5. Grishman, R. and Hischman, L. Question Answering from Natural Language Databases. Artificial Intelligence. 1978; 11; 25–43.