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Publicado en línea: 25 jun 2020
Páginas: 140 - 149
DOI: https://doi.org/10.2478/jec-2020-0013
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© 2020 Inara Brante et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Brante, Inara
EKA University of Applied SciencesRiga, Latvia
Lejniece, Ilona
EKA University of Applied SciencesRiga, Latvia
Lejnieks, Helmuts
Heli Ventures Ltd.Riga, Latvia