@article {51303,
	title = {Charge characteristics of clay separates in some soils of Egypt.},
	journal = {Bull. Fac. Agric., Cairo Univ., Conference of New Technologies in Agriculture (Special Issue).},
	year = {2006},
	author = {Kotb, M.S. and M. Abdel-Tawab and Shahin,R.R. and Y.A.Nasr and}
}
