Pawlak Z. Rough sets[J]. International Journal of Computer and Information Sciences. 1982: 341-356.
[2]
Zadeh L A. Fuzzy sets[J]. Information and Control. 1965(8): 338-353.
[3]
(Liu Q, Huang Z H, Liu S H, et al. Decision rules with rough operator and soft computing of data mining[J]. Journal of computer research and development. 1999, 36(07): 33-37.)
[4]
(Wang J, Wang R, Miao D Q, et al. Data enriching based on rough set theory[J]. Chinese journal of computers. 1998, 21(05): 393-400.)
[5]
Zhu W, Wang F Y. A new type of covering rough set[C]. In: 3rd International IEEE Conference on Intelligent Systems.London, United kingdom: IEEE Inc., 2006. 444-449.
[6]
Zhu W. Generalized Rough Sets Based on Relations[J]. Information Sciences. 2007, 177(22): 4997-5011.
[7]
Zhu W, Wang F. Topological properties in covering-based rough sets[C]. In: 4th International Conference on Fuzzy Systems and Knowledge Discovery.Haikou, China: Institute of Electrical and Electronics Engineers Inc., 2007. 289-293.
[8]
Wang S, Zhu P, Zhu W. Structure of covering-based rough sets[J]. International Journal of Mathematical and Computer Sciences. 2010, 6(3): 147-150.
(Wei L, Miao D Q, Xu F F, et al. Research on a covering rough fuzzy set model[J]. Journal of computer research and development. 2006, 43(10): 1719-1723.)
[11]
(Xu Z Y, Liao J Q. On the covering fuzzy rough sets model[J]. Fuzzy systems and mathematics. 2006, 20(03): 141-144.)
[12]
(Xu W H, Zhang W X. Fuzziness of covering generalized rough sets[J]. Fuzzy systems and mathematics. 2006, 20(06): 115-121.)
[13]
Feng T, Mi J, Wu W. Covering-based generalized rough fuzzy sets[C]. In: First International Conference on Rough Sets and Knowledge Technology.Chongqing, China: Springer Verlag, 2006. 208-215.
[14]
Zhang A, Ha M, Fan Y. Variable precision fuzzy rough set model based on fuzzy covering[C]. In: 3rd International Conference on Innovative Computing Information and Control. Dalian, Liaoning, China: Inst. of Elec. and Elec. Eng. Computer Society, 2008. 399-399.
Chen D, Wang C, Hu Q. A new approach to attribute reduction of consistent and inconsistent covering decision systems with covering rough sets[J]. Information Sciences. 2007, 177(17): 3500-3518.
[19]
Qian Y, Liang J, Pedrycz W, et al. Positive approximation: An accelerator for attribute reduction in rough set theory[J]. Artificial Intelligence. 2010, 174(9-10): 597-618.
[20]
Dubois D, Prade H. Rough fuzzy sets and fuzzy rough sets[J]. Internaltional Journal of General Systems. 1990, 17: 191-209.
[21]
Bonikowski Z, Bryniarski E, Wybraniec-Skardowska U. Extensions and intensions in the rough set theory[J]. Information sciences. 1998, 107(1-4): 149-167.
[22]
祝峰, 何华灿. 粗集的公理化[J]. 计算机学报. 2000, 23(03): 330-333.
[23]
(Zhu W, He H C. The axiomatization of the rough set[J]. Chinese journal of computers. 2000, 23(03): 330-333.)
[24]
Zhu W, Wang F. On Three Types of Covering Rough Sets[J]. IEEE Transactions on Knowledge and Data Engineering. 2007, 19(8): 1131-1144.
[25]
Keyun Q, Yan G, Zheng P. On covering rough sets[C]. In: 2nd International Conference on Rough Sets and Knowledge Technology.Toronto, Canada: Springer Verlag, 2007. 34-41.
[26]
Zhu W. Relationship between generalized rough sets based on binary relation and covering[J]. Information Sciences. 2009, 179(3): 210-225.
[27]
Wang S, Zhu W, Zhu P. Poset approaches to covering-based rough sets[C]. In: Rough Set and Knowledge Technology.Beijing: 2010. 25-29.
[28]
Yang T, Li Q. Reduction about approximation spaces of covering generalized rough sets[J]. International Journal of Approximate Reasoning. 2010, 51(3): 335-345.
[29]
Zhu W, Wang F. Reduction and axiomization of covering generalized rough sets[J]. Information Sciences. 2003, 152: 217-230.
Deng T, Chen Y, Xu W, et al. A novel approach to fuzzy rough sets based on a fuzzy covering[J]. Information Sciences. 2007, 177(11): 2308-2326.
[35]
Zhu W. A class of covering-based fuzzy rough sets[C]. In: 4th International Conference on Fuzzy Systems and Knowledge Discovery.Haikou, China: Institute of Electrical and Electronics Engineers Inc., 2007. 7-11.
[36]
Pawlak Z. Rough Sets: Theoretical Aspects of Reasoning about Data[M]. Boston: Kluwer Academic Publishers, 1991.
[37]
(Li A G, Zhang Z H, Meng Y, et al. The fuzzy mathematics and its applications[M]. Beijing: Metallurgical Industry Press, 2005.)