Abstract
Jeffrey D. Ullman. Principles of database systems. Second edition. Computer software engineering series. Computer Science Press, Rockville, Md., 1982, vii + 484 pp. - David Maier. The theory of relational databases. Computer Science Press, Rockville, Md., 1983, xv + 637 pp. - Ashok K. Chandra and David Harel. Computable queries for relational data bases. Journal of computer and system sciences, vol. 21 (1980), pp. 156–178. - Volume 51 Issue 4
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