@article {1461,
	title = {Elevated CO2 and O3 alter soil nitrogen transformations beneath trembling aspen, paper birch, and sugar maple.},
	journal = {Ecosystems},
	volume = {9},
	year = {2006},
	pages = {1354-1363},
	author = {Holmes, W.E. and Zak, D.R. and Pregitzer, K.S. and King, J.S.}
}
