The apparent barrier to the extension of yellow fever to East Africa and Asia : meeting of directors of WHO reference centres for arboviruses, chlamydiae and rickettsiae, Geneva, 1-5 April 1974
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Downs, Wilbur G., Shope, Robert E. & World Health Organization. (1974). The apparent barrier to the extension of yellow fever to East Africa and Asia : meeting of directors of WHO reference centres for arboviruses, chlamydiae and rickettsiae, Geneva, 1-5 April 1974. World Health Organization. https://iris.who.int/handle/10665/77648