db/conf/krdb/CalvaneseGLV00.html Diego Calvanese Giuseppe De Giacomo Maurizio Lenzerini Moshe Y. Vardi What is View-Based Query Rewriting? 17-27 KRDB2000/P017.pdf 2000 conf/krdb/2000 KRDB http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-29/02-cdlv.ps db/conf/krdb/krdb2000.html#CalvaneseGLV00