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Publicado en línea: 21 sept 2017
Páginas: 61 - 78
Recibido: 01 jun 2015
Aceptado: 15 jul 2015
DOI: https://doi.org/10.1515/auom-2016-0048
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© 2017
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Catarino, Paula
Mathematics Centre CMAT, Pole CMAT-UTAD, Department of Mathematics, University of Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados 5000-801,Vila Real, Portugal
Morgado, Maria Luisa
Mathematics Centre CMAT, Pole CMAT-UTAD, Department of Mathematics, University of Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados 5000-801,Vila Real, Portugal