Hussien Aly, Z. Meral Özsoyoglu. Non-deterministic Modelling of Logical Queries in Deductive Databases. In Umeshwar Dayal, Irving L. Traiger, editors, Proceedings of the Association for Computing Machinery Special Interest Group on Management of Data 1987 Annual Conference, San Francisco, California, May 27-29, 1987. pages 60-72, ACM Press, 1987. [doi]
Abstract is missing.