Volume 21.2, Issue 42, May 1989, Pages 59-62
S.D. MORGAN; R.S. HAFEZ; H.A. MOHAMED
Volume 11.1, Issue 21, June 1983, Pages 149-155
SEHAM, M. MAHMOUD; H. A. ABD EL RAHMAN; S.D. MORGAN; R.S. HAFEZ