conf/vldb/97 Vasilis Vassalos Yannis Papakonstantinou Describing and Using Query Capabilities of Heterogeneous Sources. 256-265 1997 VLDB db/conf/vldb/vldb97.html#VassalosP97 db/conf/vldb/VassalosP97.html VLDB97/P256.PDF books/aw/AhoSU86 conf/dood/PapakonstantinouGGU95 conf/sigmod/HammerGNYBV97 conf/pdis/PapakonstantinouGH96 conf/vldb/HaasKWY97 conf/pods/LevyMSS95 conf/pods/RajaramanSU95 conf/pods/LevyRU96 books/aw/AbiteboulHV95 ... conf/vldb/LevyRO96 books/cs/Ullman89 conf/pods/RamakrishnanSUV89 conf/icde/Qian96 ... conf/vldb/RothS97 ... conf/sigmod/KiferL89