Published: 2013-12-31

DOI: https://doi.org/10.69984/jopsoa.v21i1.44
DOI: https://doi.org/10.69984/jopsoa.v21i1.51
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DOI: https://doi.org/10.69984/jopsoa.v21i1.41
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DOI: https://doi.org/10.69984/jopsoa.v21i1.39
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DOI: https://doi.org/10.69984/jopsoa.v21i1.37