Affiliation: | 1. Department of Mathematics, Nanjing Normal University, Nanjing, 210097, China 2. Department of General Study Program, Jinling Institute of Technology, Nanjing, 211169, China 3. School of Mathematics and Informatics, Jiangxi Normal University, Nanchang, 330022, China 4. Department of Mathematical Sciences, Indiana University-Purdue University Fort Wayne, Fort Wayne, IN, 46805-1499, USA
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