Wilma Penzo Stefano Lodi Federica Mandreoli Riccardo Martoglia Simona Sassatelli Semantic peer, here are the neighbors you want! 26-37 2008 EDBT http://doi.acm.org/10.1145/1353343.1353351 conf/edbt/2008 db/conf/edbt/edbt2008.html#PenzoLMMS08