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Publicado en línea: 25 may 2021
Páginas: 335 - 346
Recibido: 02 ene 2021
Aceptado: 26 feb 2021
DOI: https://doi.org/10.2478/amns.2021.2.00008
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© 2021 XiuQing Yu et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Yu, XiuQing
School of Mathematics and Big Data Sciences, Dezhou UniversityDezhou, China
Kong, Shuxia
School of Mathematics and Big Data Sciences, Dezhou UniversityDezhou, China