@book{94764,
	author = {International Colloquium on Nutrient Balances and the Need for Fertilizers in Semi-Arid Regions, 17th Morocco, 1983.},
	title = {Nutrient balances and the need for fertilizers in semi-arid regions; proceedings/},
	publisher = {IPI},
	year = {1983},
	address = {Bern}
}