Affiliation: | 1. Department of Basic Science, Babol University of Technology, Babol, Islamic Republic of Iran 2. Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, Islamic Republic of Iran 3. Lehrstuhl II für Mathematik, RWTH-Aachen University, 52056?, Aachen, Germany 4. Department of Basic Science, Wuxi City College of Vocational Technology, Jiangsu?, 214153, China
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