Machine Learning: ECML 2007 18th European Conference on Machine Learning, Warsaw, Poland, September 17-21, 2007. Proceedings - Kok, Joost N.; Koronacki, Jacek; Mantaras, Raomon Lopez de; Matwin, Stan; Mladenič, Dunja; Skowron, Andrzej (Springer Berlin Heidelberg, 2007)