L'Univers quotidià Authors Xavier Jaén Downloads Download data is not yet available. Downloads HTML (Català) Published 2014-03-28 Issue Núm. 12 : Tardor del 2013 Section El racó obscur License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Recursos de Física, authors accept the following terms:Authors assign to Societat Catalana de Física (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Recursos de Física.Authors answer to Societat Catalana de Física for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.Societat Catalana de Física declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at https://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.The journal Recursos de Física is not responsible for the ideas and opinions expressed by the authors of the published articles.