Volume 24, Issue 4, December 1999, Pages 1-13
Helmy El-Sayed Ibrahim Gad; Ahmed Mohamed Hamed Kandel; Ibrahim Ibrahim Ali El-Sharkawy
Volume 24, Issue 1, March 1999, Pages 42-51
A. Kabeel; Ahmed Mohamed Hamed Kandel
Volume 22, Issue 2, June 1997, Pages 11-21
Ahmed Mohamed Hamed Kandel; Helmy El-Sayed Ibrahim Gad; S. El-Sayed