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Transmission Patterns of Smallpox: Systematic Review of Natural Outbreaks in Europe and North American Since World War II
Bhatnagar, V., Stoto, M., Morton, S., & Bozzette, S. (2006). Transmission Patterns of Smallpox: Systematic Review of Natural Outbreaks in Europe and North American Since World War II. BMC Public Health, Vol. 6.