1. Foundations of Databases;Abiteboul,1995
2. Bounded arity Datalog(≠) queries on graphs;Afrati;J. Comput. System Sci.,1997
3. Expressiveness of restricted recursive queries;Afrati,1989
4. On Datalog vs. polynomial time;Afrati;J. Comput. System Sci.,1995
5. F. Afrati, and, E. Foustoucos, Datalog program transformations and persistency numbers, manuscript, 1999.