W. H. R. Lumsden, The Night-Resting Habits of Monkeys in a Small Area on the Edge of the Semliki Forest, Uganda. A Study in Relation to the Epidemiology of Sylvan Yellow Fever, Journal of Animal Ecology, Vol. 20, No. 1 (May, 1951), pp. 11-30
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W. H. R. Lumsden (1951) studied this question.