db/journals/jacm/CosmadakisP84.html Stavros S. Cosmadakis Christos H. Papadimitriou Updates of Relational Views. 742-760 1984 31 J. ACM 4 http://doi.acm.org/10.1145/1634.1887 db/journals/jacm/jacm31.html#CosmadakisP84 JACM/31/P0742.pdf