Published Online: Jun 25, 2020
Page range: 1 - 5
DOI: https://doi.org/10.2478/host-2020-0001
© 2020 Javier Ordóñez et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Javier Ordóñez
Autonomous University of Madrid,
Antonio Sánchez
Autonomous University of Madrid,