Conference paperInteractive support for non-programmers: The relational and network approachesE.F. Codd, C.J. DateSIGFIDET 1974
PaperDie SQL-norm (the SQL standard) the SQL standardJan-Eike Michels, Krishna Kulkarni, et al.IT - Information Technology
Conference paperA normal form for preventing redundant tuples in relational databasesHugh Darwen, C.J. Date, et al.ICDT 2012