1. Foundations of Databases;Abiteboul,1995
2. Representing concurrent actions in extended logic programming;Baral,1993
3. Process algebra for synchronous communication;Bergstra;Inform. and Control,1984
4. Concurrency and communication in transaction logic;Bonner,1995
5. Representing concurrent actions and solving conflicts, Journal of the Interest Group in Pure and Applied Logics (IGPL);Bornscheuer;Special issue of the ESPRIT project MEDLAR,1996