conf/vldb/78 Adarsh K. Arora C. Robert Carlson The Information Preserving Properties of Relational Database Transformations. 352-359 1978 VLDB db/conf/vldb/vldb78.html#AroraC78 db/conf/vldb/AroraC78.html VLDB78/P352.PDF journals/tods/Bernstein76 ... conf/sigmod/CarlsonK76 persons/Codd72 ... conf/sigmod/BeeriFH77 conf/focs/AhoBU77 journals/tods/Rissanen77 persons/Codd71a conf/ifip/Codd74 journals/tods/Fagin77 conf/ifip/Armstrong74 ... ...