Volume 12, Issue 1, June 2003, Pages 9-13
Gamal Ragab
Volume 7, Issue 1, June 1998, Pages 59-65
Hisham Abdellatef; Gamal Ragab; Mohamed Baraka
Volume 3, Issue 2, December 1994, Pages 132-141
Mohamed El Balkiny; Gamal Ragab; Magda Ayad