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Abdelhaffez, Gamal S., King Abdulaziz University (KSA) and University of Assiut (Egypt)
Abdelhaffez, Gamal Saad, Mining Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia
Abdellah, Wael, Assiut University
Abdellah, Wael, Assiut University, Assiut Governorate 71515, Egypt
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