About this article
Published Online: Jan 01, 2016
Page range: 79 - 86
Received: Oct 03, 2015
Accepted: Nov 19, 2015
DOI: https://doi.org/10.21042/AMNS.2016.1.00007
Keywords
© 2016 J. Llibre, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Llibre, J.
Departament de Matemàtiques, Universitat Autònoma de BarcelonaBarcelona, Spain