Mohand Boughanem Catherine Berrut Josiane Mothe Chantal Soulé-Dupuy Advances in Information Retrieval, 31th European Conference on IR Research, ECIR 2009, Toulouse, France, April 6-9, 2009. Proceedings 5478 2009 http://dx.doi.org/10.1007/978-3-642-00958-7 978-3-642-00957-0 ECIR Lecture Notes in Computer Science Springer db/conf/ecir/ecir2009.html