Covering multigranulation trapezoidal fuzzy decision-theoretic rough fuzzy set models and applications. - Zengtai Gong; Runli Chai (J. Intell. Fuzzy Syst., 2016)

Homomorphisms between the covering information systems. - Zengtai Gong; Runli Chai; Yongping Guo (Int. J. Comput. Sci. Eng., 2018)