Nota del Editor

License

• Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution-NoDerivs License (CC BY-ND) that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
• Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
• Authors are permitted and encouraged to post their work online.