Copyright (c) 2021 Afredo Pérez-Morales, María Asunción Romero-Díaz, Salvador Gil-Guirado

This work is licensed under a Creative Commons Attribution 4.0 International License.
© Universidad de La Rioja, 2013
ISSN 0211-6820
EISSN 1697-9540
© Universidad de La Rioja, 2013
ISSN 0211-6820
EISSN 1697-9540