@book{94723,
	author = {International Symposium on Nitrogen Fixation with Nonlegumes, 3rd Helsinki, Sept.2-8, 1984.},
	title = {Nitrogen fixation with nonlegumes/},
	publisher = {Martinus Nijhoff},
	year = {1986},
	series = {Developments in Plant and Soil Science: 21},
	address = {Dordrecht}
}