Joseph M. Hellerstein Michael Stonebraker Rick Caccia Independent, Open Enterprise Data Integration. 43-49 1999 22 IEEE Data Eng. Bull. 1 db/journals/debu/debu22.html#HellersteinSC99 DEBU22-1/P43.pdf db/journals/debu/HellersteinSC99.html journals/cacm/Codd70 journals/cacm/DeWittG92 journals/debu/DeshpandeNRSTZ97 ... journals/debu/GuptaM95 conf/sigmod/ONeilQ97 journals/vldb/StonebrakerALPSSSY96