Affiliation: | 1. Department of Applied Mathematics, University of Leeds, Leeds, LS2 9JT, UK 2. Department of Mathematics, Babe?-Bolyai University, 400084, Cluj-Napoca, Romania 3. Physical Science Division, UUM College of Arts & Sciences, Building of Quantitative Sciences, Universiti Utara Malaysia, 06010, Sintok, Kedah, Malaysia 4. School of Mathematical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
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