Volume 25, Issue 1, June 2002, Pages 16-21
D. Bishay; A. Attia; S. Youssef; I. Khallaf
Volume 24, Issue 1, June 2001, Pages 83-103
D. W. Bishay; A. A. Attia; S. A. Youssef; I. S. A. Khallaf