@book{93045,
	title = {Fertilizer management practices for maize, results of experiments in the isotopes; results of a 4 year co-ordinated research programme of the joint FAO/IAEA Division of Atomic Energy in food and agriculture.},
	publisher = {IAEA},
	year = {1970},
	series = {Technical report series no.121},
	address = {Vienna}
}