Volume 41, Issue 2, May 2010, Pages 216-221
Khalifa, H. Abdel-Gawad; Abd-Elsattar, M.Metwally; Nashaat, A.Mahmoud; Mahmoud, M. A. Omar
Volume 40, Issue 1, March 2009, Pages 133-148
Hosam Ezz El-Din; K.H. Abdel-Gawad; S. M. El-Eraky; E. F.M Tolba