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Received 21 August 1995; received in revised form 15 October 1996
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Dushoff, J., Huang, W. & Castillo-Chavez, C. Backwards bifurcations and catastrophe in simple models of fatal diseases. J Math Biol 36, 227–248 (1998). https://doi.org/10.1007/s002850050099
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DOI: https://doi.org/10.1007/s002850050099