Keeling, M. J., and B. T. Grenfell. 2002. Understanding the persistence of measles: reconciling theory, simulation and observation. P Roy Soc Lond B Bio 269:335-343.
Keeling, M. J., and B. T. Grenfell. 2002. Understanding the persistence of measles: reconciling theory, simulation and observation. P Roy Soc Lond B Bio 269:335-343.