World Health: the magazine of the World Health Organization: August-September 1987 [full issue]: smallpox: never again!
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Bland, J., Viedma, C., Davies, P. & Ozorio, P. (1987). World Health: the magazine of the World Health Organization: August-September 1987 [full issue]: smallpox: never again!. World Health, (August-September), 2 - 31. World Health Organization. https://iris.who.int/handle/10665/279844