Volume 20.2, Issue 40, September 1988, Pages 20-23
S.M. EL-MAGAWRY; LA. IBRAHIM; M.F. DOWIDAR; M.A. YOUSIF
Volume 20.1, Issue 39, May 1988, Pages 8-11
A. HIFNY; A.A. MANSOUR; LA. IBRAHIM; M. TAHA
Volume 15.1, Issue 29, September 1985, Pages 43-49
A. HIFNY; A.K. AHMED; LA. IBRAHIM
Volume 12.1, Issue 23, May 1984, Pages 16-20
A. HIFNY; A.K. AHMED; LA. IBRAHIM