1. A Rule-Based Language with Functions and Sets;Abiteboul;ACM Trans. Database Syst.,1991
2. Non-Well-Founded Sets;Aczel,1988
3. AC-Unification Race: The System Solving Approach and Its Implementation;Adi,1990
4. Warren's Abstract Machine—A Tutorial Reconstruction;Aït-Kaci,1991
5. Hypersets;Barwise;The Mathematical Intelligencer,1991