变精度上近似算子与程度下近似算子的逻辑或运算模型

张贤勇

Logical OR operation model of variable precision upper approximation operator and grade lower approximation operator

ZHANG Xian-yong

系统工程理论与实践 . 2013, (5): 1277 -1282 . DOI: 10.12011/1000-6788(2013)5-1277