conf/vldb/79 Sylvia L. Osborn Towards a Universal Relation Interface. 52-60 1979 VLDB db/conf/vldb/vldb79.html#Osborn79 db/conf/vldb/Osborn79.html VLDB79/P052.PDF conf/focs/AhoBU77 books/aw/AhoHU74 conf/sigmod/AhoSU78 conf/ifip/Armstrong74 journals/is/TsichritzisK78 conf/vldb/BeeriBG78 journals/tods/Bernstein76 ... conf/sigmod/CarlsonK76 conf/sigmod/ChamberlinB74 persons/Codd71a ... journals/tods/Fagin77 ... ... journals/tods/Rissanen77 conf/sigmod/SchenkP77 journals/cacm/SmithC75 journals/jacm/Warshall62