M. Paukkeri, I. Nieminen, M. Pöllä, and T. Honkela. Coling 2008: Companion volume: Posters, page 83--86. Manchester, UK, ACL, Coling 2008 Organizing Committee, (August 2008)
A. Dickinger, A. Scharl, H. Stern, A. Weichselbraun, and K. Wöber. Information and Communication Technologies in Tourism 2008, Proceedings
of the International Conference in Innsbruck, Austria, 2008, Springer, Vienna-New York, (2008)
S. Moghaddam, and M. Ester. Proceedings of the 19th ACM international conference on Information and knowledge management, page 1825--1828. New York, NY, USA, ACM, (2010)