G. Kondrak. 12th International Conference String Processing and Information Retrieval (SPIRE), volume 3772 of Lecture Notes in Computer Science, Berlin, Germany, page 115-126. Buenos Aires, Argentina, Springer, (2005)
Y. Wang. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 955--959. Berlin, Heidelberg, Springer Verlag, (November 2007)