Volume 46.1, Issue 91, October 2001, Pages 141-149
M. Abdel H. Gamal Eldeen; M.A. Mahmoud; T.A. Hassan; R.H. Othoman
Volume 44.2, Issue 88, January 2001, Pages 79-91
M.A. Mahmoud; M.A. Haleem; A.A. Abdel Maksoud