@book{29141,
	author = {Lægreid, M. and Bøckman, Oluf Chr.},
	title = {Agriculture, fertilizers, and the environment /},
	publisher = {Cabi,},
	year = {1999.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0604/99023430-d.html}
}