About this article
Published Online: May 11, 2019
Page range: 41 - 52
Received: Dec 10, 2018
Accepted: Feb 15, 2019
DOI: https://doi.org/10.1515/caim-2019-0011
Keywords
© 2019 G. Nastasi et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Nastasi, G.
Department of Mathematics and Computer Science, University of CataniaItaly
Romano, V.
Department of Mathematics and Computer Science, University of CataniaItaly