À propos de cet article
Publié en ligne: 21 sept. 2017
Pages: 61 - 78
Reçu: 01 juin 2015
Accepté: 15 juil. 2015
DOI: https://doi.org/10.1515/auom-2016-0048
Mots clés
© 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