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  DOI: 10.4236/ijcce.2019.82002  1,725 Downloads   5,416 Views   Citations
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  DOI: 10.4236/ijcce.2019.81001  1,300 Downloads   2,842 Views   Citations
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  DOI: 10.4236/ijcce.2018.72002  1,020 Downloads   2,480 Views   Citations
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  DOI: 10.4236/ijcce.2018.71001  1,833 Downloads   6,235 Views   Citations
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