Volume 14, Issue 51, April 2019, Pages 513-527
M Samy Hefny,; A Taher Hussein,; A Mostafa Hamed; N A Mahmoud
Volume 14, Issue 51, April 2019, Pages 496-511
Tamer M Hassan; N A Mahmoud; M El-Morsi
Volume 11, Issue 38, January 2016, Pages 239-254
N Mahmoud; F Salem; M Mamdouh