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Publicado en línea: 18 sept 2020
Páginas: 9 - 26
DOI: https://doi.org/10.2478/rmm-2020-0002
© 2020 Robert W. Vallin, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Robert W. Vallin
Department of Mathematics,
Lamar University