Volume 21.1, Issue 41, January 1989, Pages 178-183
A.S. GAD; S.I. EISSA; M. EL-TRABILI; M.A.I. EL-SAYED; R.S. RAGAB; A. MOSTAFA; B.H. SERUR
Volume 10.2, Issue 20, January 1983, Pages 164-170
M.A.I. EL-SAYED; A.A. SEIDA; A.M. GHALLAB