Volume 38, Issue 1, January 2015, Pages 15-30
A.M El-Zahaby; Mofreh H Hamed; Z.M Omara; A.M Eldesoukey
Volume 30, Issue 1, January 2007, Pages 53-66
N. I. I. Hewedy; Mofreh H. Hamed; F. Sh. Abou-TaIeb; Tarek A. Ghonim
Volume 24, Issue 4, October 2001, Pages 1-31
N.H. Mahmoud