Volume 29, Issue 1, June 2009, Pages 113-124
Saeed Hammad; Mahmoud El-Gharieb; Maher Abdel- Hafez
Volume 29, Issue 1, June 2009, Pages 125-136
Saeed Hammad; Mahmoud El-Gharieb; Samy Khodeir; Maher Abdel Hafez