About this article
Published Online: May 20, 2016
Page range: 14 - 19
DOI: https://doi.org/10.1515/lpts-2016-0009
Keywords
© 2016 V. Bezrukovs, published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Bezrukovs, V.