conf/sigmod/82 Roger L. Haskin Raymond A. Lorie On Extending the Functions of a Relational Database System. 207-212 1982 SIGMOD Conference db/conf/sigmod/sigmod82.html#HaskinL82 SIGMOD82/P207.PDF http://doi.acm.org/10.1145/582353.582390 db/conf/sigmod/HaskinL82.html journals/tods/AstrahanBCEGGKLMMPTWW76 journals/cacm/Codd70 journals/tods/Codd79 ... conf/pods/JaeschkeS82