D. Tran, S. Bloehdorn, P. Cimiano, and P. Haase. Proceedings of the 1st International Conference on the Theory of Information Retrieval (ICTIR'07), (October 2007)
D. Tran, S. Bloehdorn, P. Cimiano, and P. Haase. Proceedings of the 1st International Conference on the Theory of Information Retrieval (ICTIR'07), 18th - 20th October 2007, Budapest, Hungary, page 55-68. (2007)
Y. Sure, S. Bloehdorn, P. Haase, J. Hartmann, and D. Oberle. Proceedings of the 12th Portuguese Conference on Artificial Intelligence - Progress in Artificial Intelligence (EPIA 2005), volume 3803 of LNCS, page 218 - 231. Covilha, Portugal, Springer, (December 2005)