http://doi.acm.org/10.1145/290593.290595 db/journals/sigmod/BorgidaCS98.html Alexander Borgida Vinay K. Chaudhri Martin Staudt 10-15 sigmodR/27-3/P010.pdf 1998 27 SIGMOD Record 3 http://www.acm.org/sigmod/record/issues/9809/borgida.ps db/journals/sigmod/sigmod27.html#BorgidaCS98 conf/krdb/AbernethyA98 conf/krdb/PetersonAE98 conf/krdb/AshishKS98 conf/krdb/ArenasB98 conf/krdb/BoufaidaB98 conf/krdb/Bugaenko98 conf/krdb/PazzagliaE98 conf/krdb/CritchlowGM98 conf/krdb/Decker98 conf/krdb/FernandezFLS98 conf/krdb/Freire98 conf/krdb/KarunaratnaGF98 conf/krdb/MartinPZ98 conf/krdb/RobinsonL98 conf/krdb/Russell98 conf/krdb/SeligmanSMG98 conf/krdb/SilberbergS98 conf/krdb/StarrCFW98 conf/krdb/CetintemelJFGS98 journals/cacm/GuhaL94 conf/aaai/ChaudhriFFKR98 journals/sigmod/Suciu97 conf/aaai/CalvaneseGL98 conf/vldb/BernsteinHSSZ97 journals/tods/Borgida85 ... journals/tois/MylopoulosBJKT90