Volume 5, Issue 2, April 2011, Pages 491-500
F. Maqbool; Z.A. Bhatti; A.H. Malik; A. Pervez; Q. Mahmood
Volume 4, Issue 4, November 2010, Pages 825-836
M.H. Al-Malack
Volume 1, Issue 1, January 2007, Pages 19-27