A Multi-Set Extended Relational Algebra - A Formal Approach to a Practical Issue.

Paul W. P. J. Grefen Rolf A. de By A Multi-Set Extended Relational Algebra - A Formal Approach to a Practical Issue. 80-88 ICDE94/P080.pdf 1994 ICDE db/conf/icde/icde94.html#GrefenB94 conf/icde/94 db/conf/icde/GrefenB94.html conf/vldb/Albert91 ... journals/tkde/ApersBFGKW92 books/mg/CeriP84 journals/tse/CeriG85 ... journals/cacm/Codd70 books/bc/ElmasriN89 conf/vldb/Gray81 ... ... conf/vldb/KlausnerG85 books/mg/SilberschatzK86 ... books/cs/Ullman82