A. Krotov, R. Gaizauskas, и Y. Wilks. Proceedings of the Third International Conference of the Cognitive Science of Natural Language Processing (CSNLP94), стр. 79-86. Dublin, (July 1994)
P. Cimiano, S. Staab, и J. Tane. Proceedings of the ECML/PKDD Workshop on Adaptive Text Extraction and Mining, Cavtat-Dubrovnik, Croatia, стр. 10-17. (2003)