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About The Authors
A. S. E. Khair
Omdurman Islamic University (OIU), Sudan, Omdurman.
Doctoral program of the Environmental Science, Diponegoro University, Semarang – Indonesia
Sudan
Amar Sharaf Eldin, Lecturer in Omdurman Islamic University (OIU), Sudan, Omdurman city, and student in Diponegoro University, Semarang – Indonesia