@article {28201,
	title = {Lichens on Populus tremuloides in western central Canada},
	volume = {73},
	year = {1970},
	pages = {557-578},
	publisher = {The Bryologist},
	url = {http://www.plantbiology.siu.edu/faculty/vitt/pdf/20-1973.pdf},
	author = {Jonescu, M. E.,}
}
