About this article
Published Online: Jul 16, 2014
Page range: 42 - 50
DOI: https://doi.org/10.2478/lpts-2014-0018
Keywords
© by J. Grube
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Grube, J.
Sarakovskis, A.
Doke, G.
Springis, M.