About this article
Published Online: Aug 24, 2018
Page range: 247 - 262
Received: Jun 14, 2017
Accepted: Nov 08, 2017
DOI: https://doi.org/10.1515/amsil-2017-0013
Keywords
© 2018 Paolo Lipparini, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Lipparini, Paolo
Dipartimento Produttivo di Matematica, Viale della Ricerca Scientifica, Università di Roma “Tor Vergata”,Rome, Italy