G. Buscher, A. Dengel, and L. van Elst. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 387--394. New York, NY, USA, ACM, (2008)
G. Buscher, A. Dengel, and L. van Elst. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 387--394. New York, NY, USA, ACM, (2008)
B. van Elst; Andreas Dengel. KI 2009: Advances in Artificial Intelligence. Künstliche Intelligenz (KI-2009), September 15-18, Paderborn, Germany, volume 5803 of Lecture Notes in Artificial Intelligence, LNAI, page 249-256. Springer-Verlag, Heidelberg, (September 2009)