C. J. van Rijsbergen Research and Development in Information Retrieval, Proceedings of the Third Joint BCS/ACM Symposium on Research and Development in Information Retrieval, Cambridge, 2-6 July 1984 Cambridge University Press, on behalf of the British Computer Society (copyright by British Informatics Society Ltd, a subsidiary of the British Computer Society) 1984 0521268656 db/conf/sigir/sigir84.html