Rohani, P., D. J. D. Earn, and B. T. Grenfell. 2000. Impact of immunisation on pertussis transmission in England and Wales. Lancet 355:285-286.
Rohani, P., D. J. D. Earn, and B. T. Grenfell. 2000. Impact of immunisation on pertussis transmission in England and Wales. Lancet 355:285-286.