@book{96859,
	author = {Symposium on the Utilization of Secondary and Trace Elements in Agriculture. Geneva, Palais des nations, Jan.12-16, 1987.},
	title = {The utilization of secondary and trace elements in agriculture; proceedings/},
	publisher = {Martinus Nijhoff},
	year = {1987},
	series = {Developments in Plant and Soil Sciences},
	address = {Dordrecht}
}