1. Accesoabierto.net 2016 http://www.accesoabierto.net/dulcinea/?idioma=en
2. Archambault , E. Amyot , D. Deschamps , P. Nicol , A. Provencher , F. Rebout , L. Roberge , G. 2014 Proportion of open access papers published in peer-reviewed journals at the European and World levels 1996-2013 http://www.science-metrix.com/pdf/SM_EC_OA_Availability_2004-2011.pdf
3. Measuring compliance with a Spanish Government open access mandate;Borrego;Journal of the Association for Information Science and Technology,2016
4. Budapestopenaccessinitiative.org 2016 Budapest open access initiative http://www.budapestopenaccessinitiative.org/read
5. Measuring the degrees of openness of scholarly journals with the open access spectrum (OAS) evaluation tool;Chen;Serials Review,2016