E. Hovy, L. Gerber, U. Hermjakob, C. Lin, и D. Ravichandran. Proceedings of the First International Conference on Human Language Technology and Empirical Methods in Natural Language Processing (HLT '01), March 18 - 21, 2001, San Diego, CA, USA, стр. 1--7. Association for Computational Linguistics, Morristown, NJ, USA, (2001)
S. Quarteroni, A. Moschitti, S. Manandhar, и R. Basili. Advances in Information Retrieval --- Proceedings of the 29th European Conference on Information Retrieval (ECIR 2007), 2-5 April 2007, Rome, Italy, том 4425 из Lecture Notes in Computer Science, стр. 234--245. Springer, Berlin--Heidelberg, Germany, (2007)