Volume 31, Issue 2-A, December 2020, Pages 47-56
Ahmed Siddiq; Mohamed Ghobashy; Sayed A. S. Mousa; Hamdi M. D. Nasr; Ahmed A. Atalla
Volume 19, Issue 2-C, December 2008, Pages 13-27
M. M. AFIFI; R. A. BAYOUMI