conf/vldb/82 Carol Helfgott LeDoux Douglas Stott Parker Jr. 131-141 1982 VLDB db/conf/vldb/vldb82.html#LeDouxP82 db/conf/vldb/LeDouxP82.html VLDB82/P131.PDF conf/pods/AtzeniP82 journals/tods/BeeriB79 conf/vldb/BernsteinG80 conf/sigmod/BiskupDB79 persons/Codd71a ... ... ... ... journals/tods/Lien81 journals/ipl/Osborn79 conf/vldb/ParkerD79 journals/jacm/SagivDPF81 conf/pods/Sciore83a books/cs/Ullman80