Volume 68, Issue 2, September 2023, Pages 111-129
Helmy Sakr; Islam Otify; Rezk R Ayyad; Alaa Elwan
Volume 67, Issue 1, March and April 2023, Pages 68-83
ibrahim issa; Ahmed Hammam; Helmy Sakr; Rezk Ayyad
Volume 50, Issue 2, September 2014, Pages 43-54
Rezk Ayyad
Volume 45, Issue 1, March 2012, Pages 1-13
Rezk Ayyad