Volume 60, Issue 4, October 2009, Pages 378-387
F. A. Ahmed; Sh. Sh. Emam
Volume 55, Issue 4, October 2004, Pages 619-644
F. A. Ahmed
Volume 54, Issue 1, January 2003, Pages 93-110
F. A. Ahmed
Volume 52, Issue 3, July 2001, Pages 427-444
I. A.M. Tolba; F. A. Ahmed