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Publicado en línea: 01 dic 2018
Páginas: 513 - 526
Recibido: 26 ago 2018
Aceptado: 26 nov 2018
DOI: https://doi.org/10.2478/AMNS.2018.2.00040
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© 2018 Sheng-nan Gong and Jing-li Fu, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Gong, Sheng-nan
Department of Mathematics, Zhejiang Sci-Tech UniversityHangzhou, China
Fu, Jing-li
Institute of Mathematical Physics, Zhejiang Sci-Tech UniversityHangzhou, China