About this article
Published Online: Apr 03, 2021
Page range: 49 - 65
DOI: https://doi.org/10.2478/jtes-2020-0016
Keywords
© 2020 Janis Kapenieks sen et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Kapenieks, Janis
Riga Technical UniversityRiga, Latvia
Kapenieks, Janis
Riga Technical UniversityRiga, Latvia