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Publicado en línea: 17 may 2014
Páginas: 11 - 21
DOI: https://doi.org/10.2478/lpts-2014-0009
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© by A. Sokolovs
This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sokolovs, A.
Grigans, L.
Kamolins, E.
Voitkans, J.