Kian-Lee Tan Cheng Hian Goh Beng Chin Ooi Online Feedback for Nested Aggregate Queries with Multi-Threading. 18-29 1999 VLDB db/conf/vldb/vldb99.html#TanGO99 conf/vldb/99 VLDB99/P2.pdf db/conf/vldb/TanGO99.html conf/cikm/BayardoM96 conf/vldb/Dayal87 conf/sigmod/GanskiW87 conf/ssdbm/Haas97 conf/sigmod/HaasH99 journals/jcss/HaasNSS96 conf/sigmod/HellersteinHW97 conf/pods/HouOT88 conf/sigmod/HouOT89 journals/tods/Kim82 journals/tcs/LiptonNSS93 conf/vldb/LohmanDHKS84 phd/Olken93 conf/icde/TanGO99 conf/pdis/WilschutA91