@book{94722,
	author = {International symposium on  Nitrogen Fixation with Non-Legumes . 4th, Rio de Janeiro, Aug.23-28, 1987.},
	title = {Nitrogen fixation with non legumes; proceedings.},
	publisher = {Kluwer Academic},
	year = {1989},
	series = {Developments in Plant and Soil Services, v.35},
	address = {Dordrecht}
}