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Publicado en línea: 31 mar 2018
Páginas: 73 - 81
Recibido: 01 dic 2016
Aceptado: 06 mar 2017
DOI: https://doi.org/10.1515/auom-2017-0036
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© 2018
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Kinkar Ch. Das
Department of Mathematics, Sungkyunkwan University,Suwon, Republic of Korea
Carlos M. da Fonseca
Department of Mathematics, Kuwait University,Safat, Kuwait
University of Primorska, FAMNIT, Glagoljaska 8, 6000Koper, Slovenia