@inbook {310634,
	title = {Cooperation in competition: the ecology of primate bonds. },
	booktitle = {Coalitions and alliances in humans and other animals},
	year = {1992},
	publisher = {Oxford University Press},
	organization = {Oxford University Press},
	address = {New York },
	author = {van Hoof, J. A. and van Schaik, C. P.}
}
