Stefano Rizzi Elisa Bertino Barbara Catania Matteo Golfarelli Maria Halkidi Manolis Terrovitis Panos Vassiliadis Michalis Vazirgiannis Euripides Vrachnos Towards a Logical Model for Patterns. 77-90 http://dx.doi.org/10.1007/978-3-540-39648-2_9 2003 conf/er/2003 ER db/conf/er/er2003.html#RizziBCGHTVVV03