Volume 20.1, Issue 39, May 1988, Pages 73-77
F.A. ABD EL-SALAM; N.A.M. MAHMOUD; A.F. ABD EL-GAWAD
Volume 19.2, Issue 38, January 1988, Pages 62-66
N.A.M. MAHMOUD; F.A. ABD EL-SALAM; A.F. ABD EL-GAWAD
Volume 19.1, Issue 37, September 1987, Pages 51-56
N.A.M. MAHMOUD; F.A. ABD EL-SALAM; A.F. ABD EL-GAWAD
Volume 19.1, Issue 37, September 1987, Pages 57-63
F.A. ABD EL-SALAM; N.A.M. MAHMOUD; A.F. ABD EL-GAWAD