The following publications are possibly variants of this publication:
- Impulsive vaccination of SEIR epidemic model with time delay and nonlinear incidence rateZhong Zhao, Lansun Chen, Xinyu Song. mcs, 79(3):500-510, 2008. [doi]
- Optimal control strategies for a two-group epidemic model with vaccination-resource constraintsHeting Zhang, Zhanwen Yang, Kasia A. Pawelek, Shengqiang Liu. amc, 371, 2020. [doi]
- An SEIRS epidemic model with two delays and pulse vaccinationJianjun Jiao, Lansun Chen, Shaohong Cai. jossac, 21(2):217-225, 2008. [doi]