R. Baeza-Yates, L. Calderón-Benavides, и C. González-Caro. Proceedings of String Processing and Information Retrieval (SPIRE ), том 4209 из Lecture Notes in Computer Science, стр. 98--109. Springer, (2006)
M. Pasca, B. Durme, и N. Garera. CIKM '07: Proceedings of the sixteenth ACM conference on Conference on information and knowledge management, стр. 485--494. New York, NY, USA, ACM, (2007)