Flexible query answering on graph-modeled data.

Federica Mandreoli Riccardo Martoglia Giorgio Villani Wilma Penzo Flexible query answering on graph-modeled data. 216-227 2009 EDBT http://doi.acm.org/10.1145/1516360.1516386 conf/edbt/2009 db/conf/edbt/edbt2009.html#MandreoliMVP09