The inclusion degrees of fuzzy skill maps and knowledge structures. - Bochi Xu; Jinjin Li 001 (Fuzzy Sets Syst., 2023)

Constructing polytomous knowledge structures from L-fuzzy S-approximation operators. - Gongxun Wang; Jinjin Li; Bochi Xu (Int. J. Approx. Reason., 2025)

Polytomous knowledge structures constructed by L-fuzzy approximation operators. - Bochi Xu; Jinjin Li 001; Fugui Shi (Inf. Sci., 2025)

Approximation operator applications in polytomous knowledge structures. - Bochi Xu; Jinjin Li (Comput. Appl. Math., 2025)