conf/sigmod/87 Richard A. Ganski Harry K. T. Wong Optimization of Nested SQL Queries Revisited. 23-33 1987 SIGMOD Conference db/conf/sigmod/sigmod87.html#GanskiW87 SIGMOD87/P023.PDF http://doi.acm.org/10.1145/38713.38723 db/conf/sigmod/GanskiW87.html journals/cacm/AstrahanC75 journals/tods/AstrahanBCEGGKLMMPTWW76 journals/tods/Codd79 ... journals/tods/Kim82 ... conf/sigmod/SelingerACLP79 journals/tods/StonebrakerWKH76