Published Online: Nov 22, 2018
Page range: 134 - 136
DOI: https://doi.org/10.18559/ebr.2018.4.8
© 2018 Marin A. Marinov, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Marin A. Marinov
Aalborg University,Aalborg, Denmark