MathSciNet bibliographic data MR1057044 92A15 (45J05) Diekmann, O.; Heesterbeek, J. A. P.; Metz, J. A. J. On the definition and the computation of the basic reproduction ratio \$R\sb 0\$$R\sb 0$ in models for infectious diseases in heterogeneous populations. J. Math. Biol. 28 (1990), no. 4, 365–382. Article

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