conf/vldb/87 Umeshwar Dayal Of Nests and Trees: A Unified Approach to Processing Queries That Contain Nested Subqueries, Aggregates, and Quantifiers. 197-208 1987 VLDB db/conf/vldb/vldb87.html#Dayal87 db/conf/vldb/Dayal87.html VLDB87/P197.PDF journals/jacm/BernsteinC81 ... journals/tse/CeriG85 ... journals/cacm/Codd70 persons/Codd72 journals/tods/Codd79 ... conf/pods/DayalGK82 conf/pods/Dayal83 books/sp/kimrb85/Dayal85 conf/sigmod/GraefeD87 conf/sigmod/Freytag87 conf/sigmod/GanskiW87 conf/sigmod/JarkeS82 journals/tods/Kim82 conf/sigmod/Klug82 ... conf/vldb/LohmanDHKS84 conf/sigmod/MackertL86 conf/vldb/MackertL86 ... conf/vldb/RosenthalR84 conf/sigmod/SelingerACLP79 journals/tods/Shipman81 ... journals/tods/WongY76