Volume 6, Issue 1, June 1981, Pages 122-137
Samir F. Hanna; Mahmoud M. Awad; Nabil S. Matta; Rashad M. El-Badrawy
Volume 6, Issue 1, June 1981, Pages 138-158
Samir F. Hanna; Mohamed S. Saad El-Deen; Rashad M. El-Badrawy