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 - Joost N. Kok, Jacek Koronacki, Ramon Lopez de Mantaras, Stan Matwin, Dunja Mladeni., Andrzej Skowron ((Lecture Notes in Computer Science))