Stephen H. Muggleton, Ramón P. Otero, Alireza Tamaddoni-Nezhad: Inductive Logic Programming, 16th International Conference, ILP 2006, Santiago de Compostela, Spain, August 24-27, 2006, Revised Selected Papers. Lecture Notes in Computer Science 4455, Springer 2007, ISBN 978-3-540-73846-6