About this article
Published Online: Dec 31, 2018
Page range: 546 - 553
DOI: https://doi.org/10.2478/disp-2012-0018
© 2012 Daniel Cohnitz, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Daniel Cohnitz
University of Tartu,