Alberto Belussi Omar Boucelma Barbara Catania Yassine Lassoued Paola Podestà Towards Similarity-Based Topological Query Languages. 675-686 2006 conf/edbtw/2006 EDBT Workshops http://dx.doi.org/10.1007/11896548_51 db/conf/edbtw/edbtw2006.html#BelussiBCLP06