Volume 15.1, Issue 29, September 1985, Pages 141-146
ABD EL-RAOUF MOHAMED; F.A. EL-BALKEMY; H. OMRAN; M.S. IBRAHIM
Volume 11.2, Issue 22, January 1984, Pages 67-71
A.A. BARAKAT; M.S. IBRAHIM; E.A. AFIFY