Volume 71, Issue 4, October 2020, Pages 243-250
A. A. Farag; A. A. El-Taweel; Engy Kh. Faied
Volume 65, Issue 1, January 2014, Pages 84-95
A. A. Farag; A. A. El-Taweel
Volume 51, Issue 2, April 2000, Pages 175-190
A. M. Farag; S. M.M. Morsi; Sh. Sh. Emam; N. M. Emarah