ArchiveVolume 7, Issue 3, September 2019
Abdallah Mohamed Hamed
Pages: 46-56     Published Online: Oct. 9, 2019
DOI: 10.11648/j.ajop.20190703.11        Views 48      Downloads 13
Abdallah Mohamed Hamed, Tarek Abd-Elmotelb Al-Saeed
Pages: 57-62     Published Online: Oct. 9, 2019
DOI: 10.11648/j.ajop.20190703.12        Views 48      Downloads 10
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