@book{58199,
	author = {"Mortvedt, J.J., Giordano, P.M. & Lindsat, W.L., Eds."},
	title = {"Micronutrients in Agriculture: Proceedings of the symposium held at Muscle Shoals, Alabama, April 20-22, 1971."},
	publisher = {Soil Science Society of America},
	year = {U.S.A.},
	address = {1972}
}