About this article
Published Online: Nov 05, 2014
Page range: 82 - 87
DOI: https://doi.org/10.2478/amb-2014-0010
Keywords
© 2014
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Betekhtin, M.
Ananiev, J.
Tchernev, G.
Zisova, L.
Philipov, S.
Hristova, R.