@book{24874,
	author = {Brotonegoro, S.},
	title = {Nitrogen fixation and nitrogenase activity of Azotobacter chroococcum},
	publisher = {Veenman & Zonen,},
	year = {1974},
	series = {Mededelingen Land-bouwhogeschool},
	address = {Wageningen :}
}