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Jezek, Zdenek ,  Basu, R. N ,  Arya, Z. S ,  World Health Organization ,  [Reinvestigation of smallpox outbreaks / by Z. Jezek, R.N. Basu and Z.S. Arya]

Hughes, Kenneth ,  World Health Organization ,  [Fatality, facial scarring and blindness from smallpox in Bangladesh / by Kenneth Hughes]

Hughes, Kenneth ,  Foster, Stanley O ,  Tarantola, Daniel J. M ,  Joarder, A. K ,  World Health Organization ,  [Smallpox pock mark survey in Bangladesh : with an assessment of reporting efficiency / by K. Hughes ... [et al.]]

Brilliant, Lawrence B ,  Khodakevich, L. N ,  World Health Organization ,  [The certification of smallpox eradication in countries without recent reported endemic transmission / by L.B. Brilliant and L.N. Khodakevich]