IR4873 Automatic Indexing chapter Donna Harman National Institute of Standards and Technology 14 Sparck Jones K. and Jackson D.M. (1970). The Use of Automatically-Obtained Keyword Classifications for Information Retrieval. Information Storage and Retrieval, 5, 175-201. Strzalkowski T. (1992). Information Retrieval using Robust Natuual Language. Paper loappear in the Proceed- ings of the 5th DARPA Workshop on Speech and Natural Language, Harriman, N.Y. Turtle H. and Croft W.B. (1991). Evaluation of an Inference Network-Based Retrieval Model. ACM Transac- lions on Information Systems, 9(3), 187-222. van Rijsbergen CJ. (1975). Information Retrieval. London: Butterworths. Walker, S. and Jones, R. M. (1987). Improving Subject Retrieval in Online Catalogues, British Library Research Paper 24. Weiss S.F. (1970). A Template Approach to Natural Language Analysis for Thformation Retrieval. Doctoral dissertation, Cornell University, Ithaca, N.Y.