A. Hotho, R. J�schke, C. Schmitz, and G. Stumme. The Semantic Web: Research and Applications, volume 4011 of LNAI, page 411-426. Heidelberg, Springer, (June 2006)
J. Gonzalez-Olalla, and G. Stumme. Semantic Web Mining. Proc. of the Semantic Web Mining Workshop of the 13th Europ. Conf., page 90. Helsinki, (August 2002)