Ronald Fagin Alberto O. Mendelzon Jeffrey D. Ullman A Simplified Universal Relation Assumption and Its Properties. 343-360 TODS7/P343.PDF 1982 7 ACM Trans. Database Syst. 3 db/journals/tods/tods7.html#FaginMU82 http://doi.acm.org/10.1145/319732.319735 db/journals/tods/FaginMU82.html journals/tods/AhoBU79 ... journals/tods/Beeri80 ... conf/vldb/BeeriBG78 conf/sigmod/BeeriFH77 journals/jacm/BeeriFMY83 journals/siamcomp/BeeriMSU81 conf/adbt/BeeriV79 journals/tods/Bernstein76 ... journals/cacm/Codd70 journals/tods/Fagin77 conf/sigmod/Fagin79 journals/jacm/Lien82 conf/er/Lien79 journals/tods/MaierMS79 conf/pods/MaierU82 journals/jacm/MaierSY81 conf/vldb/MendelzonM79 conf/mfcs/Rissanen78 journals/tods/Rissanen77 ... conf/sigmod/Sciore81 books/cs/Ullman80 journals/acta/Vardi83