Volume 30.2, Issue 60, January 1994, Pages 194-215
A. EL-GED; Z.M. EL-SAYED; A. KHALID; G. ABD EL-GABER; M. ABD EL-RAHMAN; M.M. EL-BARDISY
Volume 21.2, Issue 42, May 1989, Pages 113-117
A. EL-GED; A.A. EL-BASSIOUNY; A.M. KHALID; MERVET ABD EL-RAHMAN; N. KATAB