Language: English
Page range: 17 - 23
Submitted on: Nov 30, 2017
Accepted on: Jan 11, 2018
Published on: Mar 7, 2018
Published by: Konstantin Preslavski University of Shumen
In partnership with: Paradigm Publishing Services
Publication frequency: 3 issues per year
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© 2018 D. D. Enchev, published by Konstantin Preslavski University of Shumen
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.