Affiliation: | 1. School of Mathematical Sciences, Xiamen University, Xiamen, 361005, People’s Republic of China 2. Department of Mathematics, Zhanjiang Normal College, Zhanjiang, 524048, People’s Republic of China 3. Department of Mathematics, Uluda? University, 16059, Bursa, Turkey 4. Department of Mathematics, Purdue University North Central, 1401 S. U.S. 421, Westville, IN, 46391, USA
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