@article {310407,
	title = {Timing and probability of ovulation in relation to sex skin swelling in wild West African chimpanzees, Pan troglodytes verus},
	journal = {Animal Behaviour},
	volume = {66},
	year = {2003},
	month = {09/2003},
	pages = {551-560},
	chapter = {551},
	author = {Deschnera, T. and Heistermann, M. and Hodgesb, K. and Boesch, C.}
}
