3Chen P P. The entity-relationship model: toward a unified view of data[J]. ACM Transactions on Database Systems, 1976,1(1): 9-36,.
4Feldman P, Miller D. Model Clustering: Structuring a Data Model by Abstraction[J]. The Computer Journal, 1986, 29(4): 348-359.
5Teorey T J, Wei G, Botton D L, et al. E-R model clustering as an aid for user communication and documentation in databasedesign[J]. Communication of the ACM, 1989, 32(8): 975-987.
6Teorey T J, Yang D, Fry J P. A logical design methodology for relational databases using the extended E-R Model[J]. ACMComputing Survey, 1986, 18(2): 197-222.
5Belohlavek R. Fuzzy relational systems: foundations and principles [M]. New York:Kluwer Academic/Plenum Publishers,2002: 29.
6Godin R, Missaoui R, Alaoui H.Incremental concept formation algorithms based on Galois (concept) lattices[J]. Computational intelligence. 1995, 11(2): 246-267.
7Belohavek R.Algorithms for fuzzy concept lattices[EB/OL].[2015-03-18].http://wenku.baidu.com/link?url=bmX4Yw_9yXclbG0i- 3HLbuPFb_8ZM_gfQK95 dvMOzq0CuRAre8TDyNZ9ED2DLmBI9TQyfZ7dBvyjYOkPBJ6XPL6NgwH2RcdlMoz-AoA1K0i.
8Belohavek R, De baets B, Outrata B, et al. Computing the lattice of all fixpoints of a fuzzy closure operator[J]. IEEE Transactions on Fuzzy systems, 2010,18(3):546-557.
