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DOI : https://doi.org/10.31539/spej.v8i1.12186
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DOI : https://doi.org/10.31539/spej.v8i1.13320
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DOI : https://doi.org/10.31539/spej.v8i1.12628
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DOI : https://doi.org/10.31539/spej.v8i1.11098
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DOI : https://doi.org/10.31539/spej.v8i1.14134
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