@article {46562,
	title = {Soil retention, tree uptake, tree resorption of 15NH4NO3 and NH415NO3 applied to trembling and hybrid aspens at planting},
	volume = {35},
	year = {2005},
	pages = {823-831},
	publisher = {Canadian Journal of Forest Research},
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/rpv?hm=HInit\&afpf=x05-011.pdf\&journal=cjfr\&volume=35},
	author = {Choi, Woo-Jung and Chang, Scott X. and Hao, Xiying}
}
