@book{21123,
	author = {Likens, Gene E.},
	title = {Biogeochemistry of a forested ecosystem /},
	publisher = {Springer,},
	year = {2013.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy1317/2013942392-b.html}
}