Introduction

The published works by this Journal are subject to the following terms:

1. The Publication Service of the University of Murcia (the Editor) owns the copyright of its publications. It promotes and allows its use under the indicated licence in Section 2.

© Servicio de Publicaciones, Universidad de Murcia, 2011

2. Papers are digitally published under the licence Creative Commons Reconocimiento-NoComercial-SinObraDerivada 3.0 España (legal text). They can be copied, used, disseminated, transferred and publically presented if: i) the author is quoted, as well as the original source of publication (Journal, editorial and URL); ii) they are not used for commercial purposes; iii) the licence of use is mentioned.

3. Auto-file Conditions. It is allowed and authors are encouraged to digitally disseminate their pre-print versions (versions prior to review) and/or post-print (reviewed version accepted for its publication) since it promotes its early diffusion and the corresponding increase of quotes and scope within the academic community. RoMEO Colour: green.