@article {43374,
	title = {Nitrogen deposition and forest expansion in the northern Great Plains},
	volume = {89},
	year = {2001},
	pages = {807-817},
	publisher = {Journal of Ecology},
	url = {http://www.jstor.org/stable/3072154},
	author = {Kochy, M. and Wilson, S. D.}
}
