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Publicado en línea: 04 mar 2019
Páginas: 242 - 248
Recibido: 06 jul 2017
DOI: https://doi.org/10.2478/ausm-2018-0019
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© 2018 C. Carpintero et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
The aim of this paper is to introduce and study upper and lower