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Publicado en línea: 11 may 2019
Páginas: 41 - 52
Recibido: 10 dic 2018
Aceptado: 15 feb 2019
DOI: https://doi.org/10.1515/caim-2019-0011
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© 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