| Affiliation: | 1. Department of Mathematics, University of Leicester, Leicester, LE1 7RH, UK;2. Department of Physics, Mathematics and Informatics, National Academy of Sciences of Belarus, 66 Prospekt Nezavisimosti, Minsk, Belarus;1. School of Mathematical Sciences, Huaiyin Normal University, Huaian, Jiangsu 223300, China;2. Department of Mathematics, Texas State University, San Marcos, TX 78666, USA;1. Faculty of Mathematics and Statistics, Hubei University, Wuhan, 430062, China;2. School of Mathematics and Statistics, Central China Normal University, Wuhan, 430079, China;1. Departamento de Matemáticas e Instituto Universitario de Matemáticas y Aplicaciones, Universidad de Zaragoza, 50009 Zaragoza, Spain;2. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John''s, NL, A1C5S7, Canada;1. Department of Mathematics, University of Leicester, Leicester, UK;2. Department of Mathematics, Salahaddin University-Erbil, Iraq |
