R. Brooks, R. Gabriel, и G. Steele Jr.. International Joint Conference on Artificial Intelligence, 2, стр. 845--849. Karlsruhe, West Germany, William Kaufman, (августа 1983)
R. Brooks, R. Gabriel, и J. Steele. LFP '82: Proceedings of the 1982 ACM symposium on LISP and functional programming, стр. 108--113. New York, NY, USA, ACM, (1982)
R. Jr., и R. Agrawal. KDD '99: Proceedings of the fifth ACM SIGKDD international conference on Knowledge discovery and data mining, стр. 145--154. New York, NY, USA, ACM, (1999)