Volume 30.2, Issue 60, January 1994, Pages 154-164
A.M. El-KHOLY; H.I. HOSEIN; A.EL-R. THABET
Volume 28.2, Issue 56, January 1993, Pages 194-199
NAGAH M. SAAD; A.EL-R. THABET
Volume 28.2, Issue 56, January 1993, Pages 246-254
A.M. ABD EL-FATTAH; A.M. SAYED; A.M. MANAA; A.EL-R. THABET; IBTISAM M.H. EL-MILEEGY