Elmahi, Sulafa Omer Elghorashi; Supervisor, - Abdelmoneim M. Awadelgied
Co - Supervisor, - Mohmmed H. Abuuznien(sudan university of scince and technology, 2007-09-01)
El-ameer, Abeer A. E. El-ameer; Supervisor, - Mohmmed A. Elkareem; Co-Supervisor,-Nafie A. Almuslet(Sudan University of Science & Technology, 2005-06-05)