A Practitioner's View of Relational Data Base Theory.

http://doi.acm.org/10.1145/984403.984404 db/journals/sigmod/Olle75.html T. William Olle A Practitioner's View of Relational Data Base Theory. 29-43 sigmodR/07-3/P029.pdf 1975 7 FDT - Bulletin of ACM SIGMOD 3 db/journals/sigmod/sigmod7.html#Olle75