Soft set theory

Zadeh, 1965, Fuzzy sets, Infor. and Control, 8, 338, 10.1016/S0019-9958(65)90241-X

Atanassov, 1986, Intuitionistic fuzzy sets, Fuzzy Sets and Systems, 20, 87, 10.1016/S0165-0114(86)80034-3

Atanassov, 1994, Operators over interval valued intuitionistic fuzzy sets, Fuzzy Sets and Systems, 64, 159, 10.1016/0165-0114(94)90331-X

Gau, 1993, Vague sets, IEEE Trans. System Man Cybernet, 23, 610, 10.1109/21.229476

Gorzalzany, 1987, A method of inference in approximate reasoning based on interval-valued fuzzy sets, Fuzzy Sets and Systems, 21, 1, 10.1016/0165-0114(87)90148-5

Pawlak, 1982, Rough sets, International Journal of Information and Computer Sciences, 11, 341, 10.1007/BF01001956

Molodtsov, 1999, Soft set theory—First results, Computers Math. Applic., 37, 19, 10.1016/S0898-1221(99)00056-5

Pawlak, 1994, Hard set and soft sets, ICS Research Report, Institute of Computer Science

Zimmerman, 1996

Prade, 1980