@article {26790,
	title = {Age variation in phenacomys},
	volume = {42},
	year = {1961},
	pages = {44-53},
	publisher = {Journal of Mammalogy},
	url = {http://www.jstor.org/stable/1377239?seq=9},
	author = {Foster, J. Bristol and Peterson, Randolph L.}
}
