C. Basu, H. Hirsh, и W. Cohen. AAAI '98/IAAI '98: Proceedings of the fifteenth national/tenth conference on Artificial intelligence/Innovative applications of artificial intelligence, стр. 714--720. Menlo Park, CA, USA, American Association for Artificial Intelligence, (1998)
B. Ganter, и S. Kuznetsov. Conceptual Structures: Theory, Tools and Applications, том 1453 из Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (1998)
G. Sheikholeslami, S. Chatterjee, и A. Zhang. VLDB'98, Proceedings of 24rd International Conference on Very
Large Data Bases, August 24-27, 1998, New York City, New York,
USA, стр. 428-439. Morgan Kaufmann, (1998)
H. Li, и N. Abe. Proceedings of the 17th international conference on Computational linguistics-Volume 2, стр. 749--755. Association for Computational Linguistics, (1998)