https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/09/1.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/09/2.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/09/3.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/09/4.pdf
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