Uncertain mean-variance model for project portfolio selection problem with divisibility. - Xingmei Li; Zhiming Zhong; Youzhong Zhang; Yaxian Wang (J. Intell. Fuzzy Syst., 2017)

An alternative efficient representation for the project portfolio selection problem. - Xingmei Li; Yao-Huei Huang; Shu-Cherng Fang; Youzhong Zhang (Eur. J. Oper. Res., 2020)