@book{226997,
	author = {Emerich, David W. and Krishnan, Hari B.},
	title = {Nitrogen Fixation in Crop Production / David W. Emerich, Hari B. Krishnan},
	publisher = {American Society of Agronomy; Crop Science Society of America; Soil Science Society of America},
	year = {2009},
	address = {Madison}
}