@article {37652,
	title = {Silviculture and management of aspen in Canada : the western Canada scene. In : R. D. Adams, ed, Proc. Symposium on Aspen, July 25-27, 1989, Duluth, Minnesota},
	volume = {General Technical Report No. NC-140},
	year = {1990},
	pages = {39-60},
	institution = {USDA Forest Service, North Central Exp. Station},
	author = {Navratil, S. and Bella, I. E. and Peterson, E. B.}
}
