@book{29125,
	author = {Vlek, Paul L. G.},
	title = {Micronutrients in tropical food crop production /},
	publisher = {M. Nijhoff/W. Junk Publishers,},
	year = {c1985.},
	series = {Developments in plant and soil sciences ;},
	address = {Boston :},
	note = {"First published in Fertilizer research, vol. 7."}
}