L. Silva, und L. Jayaratne. Applications of Digital Information and Web Technologies, 2009. ICADIWT '09. Second International Conference on the, Seite 446-451. (August 2009)
M. Ruiz-Casado, E. Alfonseca, und P. Castells. Natural Language Processing and Information Systems, Volume 3513 von Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2005)