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Publicado en línea: 04 jul 2018
Páginas: 91 - 102
Recibido: 21 abr 2018
Aceptado: 07 may 2018
DOI: https://doi.org/10.2478/eoik-2018-0006
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© 2018 Ngatemin et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Ngatemin,
University of North SumatraMedan, Indonesia
Maksum, Azhar
University of North SumatraMedan, Indonesia
Erlina,
University of North SumatraMedan, Indonesia
Sirojuzilam,
University of North SumatraMedan, Indonesia