Volume 37, Issue 3, July 2014, Pages 357-363
Yousra Khairy; Esam Helal; Mohamed Sobeih; Khaled Ramadan
Volume 31, Issue 4, October 2008, Pages 401-405
Fahmy, S. Abdel- al-halem; S. A Ibrahim; Esam Y. Helal; M. F Sobeih