Volume 18, Issue 1, March 2010, Pages 193-202
A .A.M Elhassan; A .M.A. El-Tilib; Ibrahim ; H.S.; A.H. Awadelkarim
Volume 15, Issue 1, March 2007, Pages 197-202
M A Elsheikh; A M.A El-Tilib; E A. E Elsheikh; A H. Awad Elkarim