Key points are not available for this paper at this time.
A. P. Buxton, Observations on the Diurnal Behaviour of the Redtail Monkey (Cercopithecus ascanius schmidti Matschie) in a Small Forest in Uganda, Journal of Animal Ecology, Vol. 21, No. 1 (May, 1952), pp. 25-58
Antony Buxton (1952) studied this question.