Zhao, Zhong; Chen, Lansun; Song, Xinyu - In: Mathematics and Computers in Simulation (MATCOM) 79 (2008) 3, pp. 500-510
In this paper, an SEIR epidemic disease model with time delay and nonlinear incidence rate is studied, and the dynamical behavior of the model under pulse vaccination is analyzed. Using the discrete dynamical system determined by the stroboscopic map, we show that there exists an infection-free...