À propos de cet article
Publié en ligne: 30 janv. 2018
Pages: 77 - 90
Reçu: 27 nov. 2015
Accepté: 10 janv. 2017
DOI: https://doi.org/10.1515/udt-2017-0016
Mots clés
© 2018
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Sanna, Carlo
Department of Mathematics Università degli Studi di Torino, Torino,Via Carlo Alberto, ITALY