Volume 31.2, Issue 62, July 1994, Pages 108-117
FATMA G. SAYED
Volume 28.2, Issue 56, January 1993, Pages 157-163
H. YOUSSEF; T. EL-KHATEIB; FATMA G. SAYED; R.M. RIAD
Volume 28.2, Issue 56, January 1993, Pages 164-168
H. YOUSSEF; T. EL-KHATEIB; S.H. AFIFI; FATMA G. SAYED; R, M. RIAD