1. M. Anvari and G.F. Rose. Fuzzy relational databases. In J.C. Bezdek, editor, Artificial Intelligence And Decision Systems: Analysis of Fuzzy Information, volume III, pages 203–212. CRC Press, Boca Raton, FL, 1986.
2. D. Barbará, M. Garcia-Molina, and D. Porter. A probabilistic relational data model. Technical Report CS-TR-216-89, Department of Computer Science, Princeton University, 1989.
3. D. Barbará, H. Garcia-Molina, and D. Porter. The management of probabilistic data. IEEE Tran. Knowledge and Data Engineering, 4(5):487–502, 1992.
4. B.P. Buckles and F.E. Petry. A fuzzy representation of data for relational databases. Fuzzy Sets and Systems, 17(3):213–226, 1982.
5. B.P. Buckles and F.E. Petry. Generalized database and information systems. In J.C. Bezdek, editor, Artificial Intelligence and Decision Systems: Analysis of Fuzzy Information, volume III, pages 177–201. CRC Press, Boca Raton, FL, 1986.