Bernstein, I. S., Gordon, T. P., Rose, R. M. 1974. Factors influencing the expression of aggression during introductions to rhesus monkey groups. In: Primate Aggression, Territoriality, and Xenophobia. Holloway, R. L. (ed), 211-240. Academic Press, New York, NY.

What we have demonstrated is that the introduction of rhesus monkeys [both sexes, different ages, different rearing histories/personalities] to an established rhesus monkey social unit can be a potent stimulus for eliciting aggression. ... Rhesus monkeys in the laboratory have well-earned reputations for their aggressive response and near-intractable disposition.