[1]
Dynamical behavior of epidemiological models with nonlinear incidence rates[J] . Wei-min Liu,Herbert W. Hethcote,Simon A. Levin.  Journal of Mathematical Biology . 1987 (4)
[1]
Dynamical behavior of epidemiological models with nonlinear incidence rates[J] . Wei-min Liu,Herbert W. Hethcote,Simon A. Levin.  Journal of Mathematical Biology . 1987 (4)