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The works published in this journal are subject to the following terms:

1. The Publications Service of the University of Murcia (the publisher) retains the property rights (copyright) of the published works, and encourages and allows their reuse under the license of use indicated in point 2.

© Publications Service, University of Murcia, 2011

2. The works are published in the electronic edition of the journal under a Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 Spain license (legal text). They may be copied, used, distributed, transmitted and publicly displayed, provided that: i) the authorship and the original source of their publication (journal, publisher and URL of the work) are cited; ii) they are not used for commercial purposes; iii) the existence and specifications of this license of use are mentioned.