Volume 19, Issue 2, June 1994, Pages 23-35
Farouk Mahmoud Abd El-Kader; Ibrahim Abdo Ahmed Amin; Hassan El-Deep; M. A. Ismaiel
Volume 17, Issue 4, December 1992, Pages 45-51
Ibrahim A. Amin; Hassan E. El-Deeb; Arafa A. Helal