Constraint Query Algebras - Goldin (1997)(Correct)(17 citations)
collaborate on joint publications: Gabi Kuper, Jan Chomicki, and Alex Brodsky. I thank people at Brown and
presented here, written with Gabi Kuper and Jan Chomicki, has appeared in [CGK96]6.2 Aggregation in www.cs.brown.edu/people/dqg/Papers/thesis.ps