conf/vldb/86 Ravi Krishnamurthy Haran Boral Carlo Zaniolo Optimization of Nonrecursive Queries. 128-137 1986 VLDB db/conf/vldb/vldb86.html#KrishnamurthyBZ86 db/conf/vldb/KrishnamurthyBZ86.html VLDB86/P128.PDF ... ... journals/csur/GallaireMN84 journals/tods/IbarakiK84 ... conf/adbt/KelloggT79 ... ... ... conf/sigmod/SelingerACLP79 ... journals/tods/Ullman85 ... conf/vldb/Zaniolo85