game playing reference
Rada Chirkova, Michael Genesereth: Linearly Bounded Reformulations of Unary Databases. Symposium on Abstraction, Reformulation, and Approximation, 2000.
Rada Chirkova, Michael Genesereth: Linearly Bounded Reformulations of Conjunctive Databases. International Conference of Deductive and Object-Oriented Databases,2000.
Rada Chirkova, Michael Genesereth: Database Reformulation with Integrity Constraints. The Logic and Computational Complexity Workshop, in conjunction with the Conference on Logic in Computer Science, 2005.
Jeffrey Ullman: Principles of Database and Knowledgebase Systems, Volume 2, Computer Science Press, 1989.