Volume 17, Issue 3, September 1992, Pages 61-69
Ahmed Abd El-Shafi; Syed Abid A. Naqvi
Volume 13, Issue 2, December 1988, Pages 1-16
Ibrahim Elewa Ammar; Ahmed Abd El-Shafi
Volume 13, Issue 1, June 1988, Pages 1-16
Ahmed Abd El-Shafi; Ibrahim Mohamed Elewa Ammar