@book{61011,
	author = {Ali, R. A. M. and Abd-Elkader,D.Y},
	title = {Influence of application systems of K₂SO₄ and foliar application of micronutrient mixtures on cassava grown in sandy soil},
	url = {http://nile.enal.sci.eg/EALE/2014/ASEJ/3514/4/314.pdf}
}