Positive periodic solutions for the neutral ratio-dependent predator-prey model. - Fengqin Zhang; Chongwu Zheng (Comput. Math. Appl., 2011)

Dynamics of an HBV/HCV infection model with intracellular delay and cell proliferation. - Fengqin Zhang; Jianquan Li; Chongwu Zheng; Lin Wang 018 (Commun. Nonlinear Sci. Numer. Simul., 2017)