1. Periodicity in an epidemic model with a generalized non-linear incidence,;M. E. Alexander;Math. Biosci.,2004
2. Bifurcation analysis of an SIRS epidemic model with generalized incidence,;M. E. Alexander;SIAM J. Appl. Math.,2005
3. A generalization of the Kermack-McKendrick deterministic epidemic model,;V. Capasso;Math. Biosci.,1978
4. Homoclinic orbits in a disease transmission model with nonlinear incidence and nonconstant population,;W. R. Derrick;Discrete Contin. Dyn. Syst. Ser. B,2003
5. Recurrent outbreaks of childhood disease revisited: The impact of isolation,;Z. Feng;Math. Biosci.,1995