About this article
Published Online: Jul 17, 2018
Page range: 95 - 103
DOI: https://doi.org/10.2478/jef-2018-0006
© 2018 Kirsti Jõesalu et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Kirsti Jõesalu
University of Tartu,
Ene Kõresaar
University of Tartu,