About this article
Published Online: Jul 18, 2019
Page range: 77 - 96
Received: Mar 18, 2019
Accepted: Apr 15, 2019
DOI: https://doi.org/10.2478/amsil-2019-0004
Keywords
© 2019 Gian Luigi Forti, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Forti, Gian Luigi
Università degli Studi di Milano, Dipartimento di MatematicaMilano, Italy