@article {853,
	title = {Social trajectories: a unifying approach to understanding social evolution. },
	journal = {Oikos},
	volume = {96},
	year = {2002},
	pages = {206-216},
	author = {Cahan, S. and Blumstein, D.L. and Sundstr{\"o}m, L. and Liebig, J. and Griffin, A.}
}
