摘要本文继续文[1]的工作,进一步讨论了系统x=rx2(1-x/K)-xy,y=xy()的拓扑结构.The work of [1] is continued and the topological structures of system x = rx2 (l - ) - sy, y = xy () are discussed.
3LIU Wei-min,LEVIN S A,IWASA Y,et al.Influence of nonlinear incidence rates upon the behavior of SIRS epidemiological models[J].J Math Biol,1986,23(1):187-204.
4LIU Xuan-liang.Qualitative analysis of SIRS epidemiological models with nonlinear incidence rates[J].J Biomath,1996,11(2):1-6.
5GOBBER F,WILLAMOWSKI K D.Liapunov approach to multiple Hopf bifurcation[J].J of Math Anal and Appl,1979,71(3):333-350.