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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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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 
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Min Li, Maoan Han. On the number of limit cycles of a quartic polynomial system. Discrete & Continuous Dynamical Systems  S, 2021, 14 (9) : 31673181. doi: 10.3934/dcdss.2020337 
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