Volume 39, Issue 2, December 2019, Pages 231-251
Ahmed Abdulhakim ElGendy; Wael Mohamed Elsaed; Abdel naser Badawy
Volume 39, Issue 2, December 2019, Pages 252-270
Ahmed Abdulhakim ElGendy; Wael Mohamed Elsaed; Haussain A Elaziz; Amr Ahmed