@book{15377,
	author = {El-Saady, Salah Abdel-Raouf Abdel-Monem Mohamed. },
	title = {Reactivity of phosphogypsum in some Egyptian soils and its relation to nutrients uptake by plant},
	year = {2005},
	url = {http://nile.enal.sci.eg/thesis/1832.pdf}
}