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
Volume 14, Issue 2, September 2006, Pages 873-880
Elsheikh M.A.; A.M.A. El-Tilib; E.A.E. Elsheikh; A.H. Awad Elkarim