About this article
Published Online: Mar 17, 2016
Page range: 24 - 33
DOI: https://doi.org/10.1515/lpts-2016-0003
Keywords
© 2016 S. Upnere et al., published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Upnere, S.
Jekabsons, N.
Locans, U.