conf/vldb/92 Weimin Du Ravi Krishnamurthy Ming-Chien Shan Query Optimization in a Heterogeneous DBMS. 277-291 1992 VLDB db/conf/vldb/vldb92.html#DuKS92 http://www.vldb.org/conf/1992/P277.PDF journals/computer/AhmedSDKKLRS91 conf/vldb/BittonDT83 conf/edbt/ChimentiGK90 books/mg/CeriP84 ... conf/sigmod/GangulyHK92 ... ... ... conf/vldb/KrishnamurthyBZ86 ... conf/sigmod/SelingerACLP79 journals/tods/WhangK90