Wei Cheng, Zhi Wen Mo, Jue Wang. Notes on the lower and upper approximations in a fuzzy group and rough ideals in semigroups . Inf. Sci., 177(22):5134-5140, 2007. [doi]
@article{ChengMW07:1,
title = {Notes on the lower and upper approximations in a fuzzy group and rough ideals in semigroups },
author = {Wei Cheng and Zhi Wen Mo and Jue Wang},
year = {2007},
doi = {10.1016/j.ins.2006.12.006},
url = {http://dx.doi.org/10.1016/j.ins.2006.12.006},
researchr = {https://researchr.org/publication/ChengMW07%3A1},
cites = {0},
citedby = {0},
journal = {Inf. Sci.},
volume = {177},
number = {22},
pages = {5134-5140},
}