Volume 19, Issue 1, March 2009, Pages 1-10
H. A. Bakr; E. M. Said; M. M. Abd El-Tawab; M. S. Hassan
Volume 18, Issue 1, March 2008, Pages 102-109
H. M. El-Attar; Yassein M. Abd El-Raof; M. M. Ghanem