Volume 37.2, Issue 74, July 1997, Pages 33-42
A. NASSAR; A. AHMED
Volume 20.1, Issue 39, May 1988, Pages 115-120
A. LOTFI; T. EL-KHATEIB; H. ABDEL-RAHMAN; S.H. AHMED; M. EL-TARABILI; A. AHMED