Tore Risch Martin Sköld Active Rules based on Object-Oriented Queries. 27-30 1992 http://sites.computer.org/debull/92DEC-CD.pdf 15 IEEE Data Eng. Bull. 1-4 db/journals/debu/debu15.html#RischS92 ... journals/dke/ChakravarthyM94 conf/oodbs/DayalBM88 conf/sigmod/McCarthyD89 ... conf/sigmod/Hanson92 journals/tkde/LitwinR92 conf/vldb/Risch89 conf/vldb/RosenthalCBB89 journals/toplas/PaigeK82 conf/sigmod/WidomF90