Esra Erdem Fangzhen Lin Torsten Schaub Logic Programming and Nonmonotonic Reasoning, 10th International Conference, LPNMR 2009, Potsdam, Germany, September 14-18, 2009. Proceedings 5753 2009 http://dx.doi.org/10.1007/978-3-642-04238-6 978-3-642-04237-9 LPNMR Lecture Notes in Computer Science Springer db/conf/lpnmr/lpnmr2009.html