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"The ϑ-lower and T-upper fuzzy rough approximation operators on a ..."
Fei Li, Yunqiang Yin (2012)
- Fei Li, Yunqiang Yin:
The ϑ-lower and T-upper fuzzy rough approximation operators on a semigroup. Inf. Sci. 195: 241-255 (2012)
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