S. Agarwal, and S. Lamparter. Proceedings of the 7th International IEEE Conference on E-Commerce Technology 2005, Munich, Germany, IEEE Computer Society, (July 2005)
V. Russo. University of Naples ``Federico II'', Corso Umberto I, 80100 Naples, Italy, (2007)(Download from http://thesis.neminis.org/2008/01/28/thesis-final-draft/).
R. Jäschke, L. Marinho, A. Hotho, L. Schmidt-Thieme, and G. Stumme. Knowledge Discovery in Databases: PKDD 2007, 11th European Conference on Principles and Practice of Knowledge Discovery in Databases, Warsaw, Poland, September 17-21, 2007, Proceedings, volume 4702 of Lecture Notes in Computer Science, page 506-514. Springer, (2007)
J. Paakki, A. Karhinen, J. Gustafsson, L. Nenonen, and A. Verkamo. Proceedings of the International Conference on Software: Theory and Practice (16th IFIP World Computer Congress), page 325--332. Beijing, China, (2000)
G. Cocho, R. Mansilla, and G. Martinez-mekler. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)