Volume 29.1, Issue 57, April 1993, Pages 73-80
N.A.M. MAHMOUD; F.A. ABDEL SALAM; SA ALYAN
Volume 19.1, Issue 37, September 1987, Pages 154-159
I.M. MOURAD; M.H. KARRAM; TH.S. ABDEL ALL; F.A. ABDEL SALAM