V. Spiliopoulos, A. Valarakos, and G. Vouros. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (June 2008)
L. Schmidt-Thieme. Proceedings of the 5th IEEE International Conference on Data Mining (ICDM 2005), 27-30 November 2005, page 378-385. Houston, Texas, USA, IEEE Computer Society, (2005)