Destruction of variola virus : memorandum from a WHO meeting
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Monkeypox virus as a potential source of variola virus / F. Fenner, K.R. Dumbell, S.S. Marennikova & J.H. Nakano Fenner, Frank; Dumbell, Keith R; Marennikova, Svetlana; Nakano, James H; World Health Organization (WHO/SE/80.154, 1980)