1. Boundedness of single rule programs is undecidable;Abiteboul;Information Processing Letters,1989
2. Datalog versus first order;Aitai,1989
3. Performance evaluation of data intensive logic programs;Bancilhon,1988
4. Horn clause queries and generalizations;Chandra;Journal of Logic Programming,1985
5. Decidable optimization problems for database logic programs;Cosmadakis,1988