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DOI : https://doi.org/10.31539/spej.v7i1.6869
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DOI : https://doi.org/10.31539/spej.v7i1.8611
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DOI : https://doi.org/10.31539/spej.v7i1.8617
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DOI : https://doi.org/10.31539/spej.v7i1.8648
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