conf/sigmod/93 Serge Abiteboul Georg Lausen Heinz Uphoff Emmanuel Waller Methods and Rules. 32-41 1993 SIGMOD Conference db/conf/sigmod/sigmod93.html#AbiteboulLUW93 http://doi.acm.org/10.1145/170035.170044 db/conf/sigmod/AbiteboulLUW93.html SIGMOD93/P032.PDF conf/sigmod/AbiteboulB91 ... journals/tods/AbiteboulG91 conf/sigmod/AbiteboulH88 conf/sigmod/AbiteboulK89 conf/pods/AbiteboulKW90 ... journals/jlp/Ait-KaciN86 conf/dood/BrassL91 conf/edbt/BertinoM92 conf/ijcai/Brewka87 conf/sigmod/CacaceCCTZ90 ... journals/jlp/Fitting85a conf/sigmod/KiferL89 journals/jacm/KiferLW95 conf/sigmod/LouO91 journals/logcom/LaenensV92 ... ... books/cs/Ullman88 journals/jacm/GelderRS91