H. Cankaya, и D. Moldovan. K-CAP '09: Proceedings of the fifth international conference on Knowledge capture, стр. 57--64. New York, NY, USA, ACM, (2009)
J. Espinosa, и H. Lieberman. MICAI: Fourth Mexican International Conference on Artificial Intelligence, том 3789 из Lecture Notes in Computer Science, стр. 61-69. Springer, (2005)
M. Hsu, и H. Chen. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, стр. 651--652. New York, NY, USA, ACM, (2006)
H. Liu, и P. Singh. Proc. of the 8th International Conference on Knowledge-Based Intelligent Information and Engineering Systems (KES-2004) - Wellingtonand New Zealand, Springer-Verlag, (сентября 2004)