Volume 36, Issue 1, January 2013, Pages 69-77
E Ghorab; Y. Esam Helal; S Mahgoub; M.F Sobeih; A Shalash
Volume 35, Issue 2, April 2012, Pages 129-137
Hitham Abdel Samad; Y. Esam Helal; S.A Ibrahim; M.F Sobeih