Volume 21.1, Issue 41, January 1989, Pages 113-118
S.S. SALLAM; RAGAA S. HAFEZ; S.D. MORGAN; H.A. EL-ESSAWY
Volume 21.1, Issue 41, January 1989, Pages 119-121
RAGAA S. HAFEZ; S.D. MORGAN; M.A. MOHAMED