@book{41136,
	author = {Stewart, W. D. P. and International Biological Programme},
	title = {Nitrogen fixation by free-living micro-organisms /},
	publisher = {Cambridge University Press,},
	year = {2011},
	address = {Cambridge :},
	note = {"Papers presented at an IBP synthesis meeting on nitrogen fixation held in Edinburgh in September 1973, together with contributions submitted by other[s]."}
}