@article {28734,
	title = {Aspects of evolution and adaption in American black bear (Ursus americanus Pallus) and brown and grizzly bears (Ursus arctos Linne.) of North America},
	year = {1972},
	note = {International Conference on Bear Research and Management 2},
	pages = {153-159},
	author = {Herrero, S.}
}
