conf/vldb/92 M. Muralikrishna Improved Unnesting Algorithms for Join Aggregate SQL Queries. 91-102 1992 VLDB db/conf/vldb/vldb92.html#Muralikrishna92 db/conf/vldb/Muralikrishna92.html VLDB92/P091.PDF journals/cacm/AstrahanC75 conf/vldb/Dayal87 ... conf/sigmod/GanskiW87 ... journals/tods/Kim82 conf/vldb/Muralikrishna89 conf/sigmod/RosenthalG90