Volume 34, Issue 1, January 2011, Pages 19-26
Doaa E. El-Agha; Mohammed M. Salama; Ashraf M. Ghanem
Volume 31, Issue 3, July 2008, Pages 251-257
Salem A. El-Saiah; S. M. selim
Volume 24, Issue 3, July 2001, Pages 193-218
M. Khalil Bassiouny