Affiliation: | 1. Department of Mathematics, Pedagogical University, Podchora??ych 2, 30-084, Kraków, Poland 2. Faculty of Mathematics and Natural Sciences, University of Rzeszów, Rejtana 16A, 35-959, Rzeszow, Poland 3. Department of Mathematics, Sichuan University, Chengdu, 610064, Sichuan, People’s Republic of China
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