@article {1904,
	title = {Male Tolerance and Male-Male Bonds in a Multilevel Primate Society},
	journal = {Proceedings of the National Academy of Sciences (PNAS)},
	volume = {111},
	year = {2014},
	pages = {14740-14745},
	author = {Annika Patzelt and Gisela H. Kopp and Ibrahima Ndao and Urs Kalbitzer and Dietmar Zinner and Julia Fischer}
}
