@book{82141,
	author = { E.Zehler, H.Kreipe and Gething, P.A.},
	title = {Potassium sulphate and potassium chloride; their influence on the yield and quality of cultivated plants.},
	publisher = {IPI},
	year = {1981},
	series = {IPI Research Topics; No.9},
	address = {Bern}
}