This work was published on the website of Zenda, which belongs to Ruritania Editores S.L. According to the legal notice and the intellectual property, it authorises the view, impression, downlad, storage amd share whether in whole or in part is permitted. The following terms must be followed:
It is not permitted to distort the content of the information (see moral rights).
The user must cite the source and the date of the documents subject to reproduction.