Affiliation: | 1. Department of Mathematical Sciences, University of Zululand, Private Bag X1001, Kwa-Dlangezwa, 3886, South Africa 2. Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54 001, Durban, 4000, South Africa 3. Physics Department, Institute of Physics and Technology, Kant Baltic Federal University, A. Nevsky Str.,B. 14, Kaliningrad, 236041, Russia 4. Laboratory of Gravitation, Cosmology, Astrophysics, Ulya Ulyanov State Pedagogical University, 100 years V.I.Lenin’s Birthday Square, 4, Ulyanovsk, 432700, Russia
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