Volume 34, Issue 1, March 2009, Pages 14-21
Shawkat K. Guirguis; Hossam A. Nour; Abd El-Ghafar R. Abd El-Haleem
Volume 20, Issue 4, December 1995, Pages 24-47
Shawkat Kamal Guirguis
Volume 20, Issue 4, December 1995, Pages 48-60
Shawkat Kamal Guirguis; Mohamed Ezz El-Din El-Raey; Essam Aly