Volume 15, Issue 2, December 1990, Pages 34-43
El-Sayed Abdel-Azim Mohamed Shawaly
Volume 15, Issue 1, June 1990, Pages 35-46
El-Sayed Abd El-Azim Mohamed Shawaly
Volume 14, Issue 1, June 1989, Pages 83-96
Ahmed A.T. Abd ElMegeed; El-Sayed Abdel-Azim M. Shawaly