Foreword

License

This journal and its articles are published under the Creative Commons  Creative Commons  Atribución-NoComercial-CompartirDerivadasIgual 2.5 (Argentina) (CC BY-NC-SA 2.5 AR) license, which allows the user to download, share, copy and redistribute the material in any format, provided the user can reliably prove his/her condition and provides a link to the license, and allows remixing, transforming and building upon the material, with the contribution being distributed under the same license as the original.  Said license does not authorize the use of the contents for commercial purposes.