R. Aler, D. Borrajo, и P. Isasi. Proceedings of the 2001 Congress on Evolutionary
Computation CEC2001, стр. 1220--1227. COEX, World Trade Center, 159 Samseong-dong,
Gangnam-gu, Seoul, Korea, IEEE Press, (27-30 May 2001)
R. Baeza-Yates. Proceedings of 5th international conference on Computational Linguistics and Intelligent Text Processing (CICLing), том 2945 из Lecture Notes in Computer Science, стр. 445--456. Seoul, Korea, Springer, (2004)
J. Bai, D. Song, P. Bruza, J. Nie, и G. Cao. CIKM '05: Proceedings of the 14th ACM international conference on Information and knowledge management, стр. 688--695. New York, NY, USA, ACM Press, (2005)
A. Berger, и J. Lafferty. SIGIR '99: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval, стр. 222--229. New York, NY, USA, ACM Press, (1999)