@article {44837,
	title = {Propagation of trembling aspen and hybrid poplar for agroforestry : potential benefits of elevated CO2 in the greenhouse},
	volume = {59},
	year = {2003},
	pages = {61-71},
	publisher = {Agroforestry Systems },
	url = {http://www.springerlink.com/content/w51lt05822tu5157/fulltext.pdf},
	author = {Tupker, Kendall, A. and Thomas Barb R. and Macdonald, S. Ellen}
}
