Diterbitkan: 2013-07-04

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https://doi.org/10.22435/pgm.v33i2.3115.
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https://doi.org/10.22435/pgm.v33i2.3118.
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https://doi.org/10.22435/pgm.v33i2.3121.
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https://doi.org/10.22435/pgm.v33i2.3122.
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https://doi.org/10.22435/pgm.v33i2.3123.