Volume 12.1, Issue 23, May 1984, Pages 166-171
M.H. KARRAM; A.A. AMER; H.A. IBRAHIM
Volume 11.2, Issue 22, January 1984, Pages 161-167
A.H. EL-SEBAIE; H.A. IBRAHIM; A.A. IBRAHIM; W. HOFMANN; A.A. AMER