Sonia Bergamaschi Flavio Bonfatti Claudio Sartori Entity-Situation: A Model for the Knowledge Representation Module of a KBMS. 578-582 1988 conf/edbt/88 EDBT EDBT88/P578.pdf db/conf/edbt/edbt88.html#BergamaschiBS88 http://dx.doi.org/10.1007/3-540-19074-0_79 ... ... journals/tods/Chen76 ... ... ... ... ...