conf/sigmod/91 Ravi Krishnamurthy Witold Litwin William Kent Language Features for Interoperability of Databases with Schematic Discrepancies. 40-49 1991 conf/sigmod/91 SIGMOD Conference db/conf/sigmod/sigmod91.html#KrishnamurthyLK91 http://doi.acm.org/10.1145/115790.115795 SIGMOD91/P040.PDF conf/edbt/AbiteboulG88 conf/sigmod/Annevelink91 conf/pods/BancilhonK86 journals/tods/BancilhonS81 conf/slp/ChenKW89 journals/tods/DayalB82 journals/tse/DayalH84 ... conf/pods/Keller85 ... ... ... conf/vldb/KrishnamurthyN88 ... conf/sigmod/MotroB81 conf/pods/NaqviK88 books/cs/NaqviT89 ... journals/computer/AhmedSDKKLRS91 journals/ibmsj/Zloof77