Volume 38, Issue 1, March 2013, Pages 1-13
A. Helal; H. El Dessouki; A. Hatata; Magdi Mohamed Ali El-Saadawi; Mohamed Abd El-Moneim Mohamed Tantawy
Volume 35, Issue 3, September 2010, Pages 10-22
Ahmed Helal; Magdy Mohamed Ali El-Saadawi; Ahmed Hatata