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Publicado en línea: 25 abr 2014
Páginas: 181 - 189
Recibido: 27 mar 2013
Aceptado: 01 jul 2013
DOI: https://doi.org/10.2478/v10100-012-0005-9
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© by Svetoslav Spasov
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.
Spasov, Svetoslav
Arkumarev, Volen
Dobrev, Dobromir
Dobrev, Vladimir