conf/vldb/95 Rakesh Agrawal Giuseppe Psaila Edward L. Wimmers Mohamed Zaït Querying Shapes of Histories. 502-514 1995 VLDB db/conf/vldb/vldb95.html#AgrawalPWZ95 db/conf/vldb/AgrawalPWZ95.html VLDB95/P502.PDF ... conf/kdd/BerndtC94 conf/vldb/ChakravarthyKAK94 ... conf/ride/GatziuD94 conf/vldb/GehaniJS92 books/aw/HopcroftU79 conf/icde/SeshadriLR95 journals/cacm/WuM92