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Raves, clubs and ecstasy: the impact of peer pressure
Epidemic models with nonlinear infection forces
1.  Department of Mathematics, Southwest Normal University, Chongqing, 400715, PR, China 
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Tianhui Yang, Lei Zhang. Remarks on basic reproduction ratios for periodic abstract functional differential equations. Discrete & Continuous Dynamical Systems  B, 2019, 24 (12) : 67716782. doi: 10.3934/dcdsb.2019166 
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Xin Zhao, Tao Feng, Liang Wang, Zhipeng Qiu. Threshold dynamics and sensitivity analysis of a stochastic semiMarkov switched SIRS epidemic model with nonlinear incidence and vaccination. Discrete & Continuous Dynamical Systems  B, 2020 doi: 10.3934/dcdsb.2021010 
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Tom Burr, Gerardo Chowell. The reproduction number $R_t$ in structured and nonstructured populations. Mathematical Biosciences & Engineering, 2009, 6 (2) : 239259. doi: 10.3934/mbe.2009.6.239 
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Naeem M. H. Alkoumi, Pedro J. Torres. Estimates on the number of limit cycles of a generalized Abel equation. Discrete & Continuous Dynamical Systems, 2011, 31 (1) : 2534. doi: 10.3934/dcds.2011.31.25 
[19] 
Min Li, Maoan Han. On the number of limit cycles of a quartic polynomial system. Discrete & Continuous Dynamical Systems  S, 2020 doi: 10.3934/dcdss.2020337 
[20] 
Jinhu Xu, Yicang Zhou. Global stability of a multigroup model with generalized nonlinear incidence and vaccination age. Discrete & Continuous Dynamical Systems  B, 2016, 21 (3) : 977996. doi: 10.3934/dcdsb.2016.21.977 
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