Elmangoushi, Hamid Abdelaal; Supervisor, - Isam Mohammed Abdel-Magid; Co - Supervisor, - Mohammed Kheir Salih(Sudan University of Science &Technology, 2010-08-01)
ibrahim, alsaddig mohamed; Supervisor, - Abbas Abd Alla Ibrahim; Co- Supervisor, - Elsaddig El Hadi El Hassan(Sudan University of Science &Technology, 2013-03-01)