Affiliation: | 1. Department of Mathematics, Guizhou University, Guiyang, Guizhou, 550025, P.R. China 2. Department of Mathematics, Xiangtan University, Xiangtan, Hunan, 411105, P.R. China 3. Department of Mathematical Analysis and Numerical Mathematics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina, 842 48, Bratislava, Slovakia 4. Mathematical Institute, Slovak Academy of Sciences, ?tefánikova 49, 814 73, Bratislava, Slovakia
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