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Publicado en línea: 30 nov 2017
Páginas: 485 - 494
Recibido: 07 jun 2017
Aceptado: 30 nov 2017
DOI: https://doi.org/10.21042/AMNS.2017.2.00040
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© 2017 M.S. Bruzón, T.M. Garrido and R. de la Rosa, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Bruzón, M.S.
Department of Mathematics, University of CadizCádiz, Spain
Garrido, T.M.
Department of Mathematics, University of CadizCádiz, Spain
de la Rosa, R.
Department of Mathematics, University of CadizCádiz, Spain