@book{3139,
	author = {Ladha, J. K. and International Congress of Soil Science},
	title = {Biological nitrogen fixation for sustainable agriculture :},
	publisher = {Kluwer Academic Publishers ;},
	year = {1992.},
	address = {Dordrecht ;},
	note = {"Reprinted from Plant and soil, volume 141 (1992)."},
	url = {http://www.loc.gov/catdir/enhancements/fy0822/92010783-d.html}
}