Volume 31.2, Issue 62, July 1994, Pages 48-62
M.A. ATTIA; A.T.G. AHMED; SOAD S. ALI*; SADIA R
Volume 27.2, Issue 54, July 1992, Pages 20-41
M. TAHA; I.A. IBRAHIM; A.T.G. AHMED; A.A. MANSOUR