William Kent The Universal Relation Revisited. 644-648 TODS8/P644.PDF 1983 8 ACM Trans. Database Syst. 4 db/journals/tods/tods8.html#Kent83 http://doi.acm.org/10.1145/319996.320019 db/journals/tods/Kent83.html journals/tods/AhoBU79 conf/pods/AtzeniP82 conf/vldb/BeeriBG78 journals/tods/FaginMU82 journals/tods/Kent81 journals/cacm/Kent83 journals/tods/MaierU83 ... conf/sigmod/MaierW82 conf/sigmod/Minker75 journals/tods/Rissanen77 conf/mfcs/Rissanen78 ... conf/pods/Ullman82 books/cs/Ullman82 journals/tods/Ullman83a