Volume 30.2, Issue 60, January 1994, Pages 11-20
K.E.H. ABDALLA; SALMA, A. MOHAMED
Volume 28.2, Issue 56, January 1993, Pages 1-14
SALMA, A. MOHAMED; K.E.H. ABDALLA; M. TAHA; YOUSRIA, A. ABDEL-RAHMAN