1 Department of Mathematics, University of Mazandaran, Babolsar 47416-95447, Iran.
2 International Institute for Symmetry Analysis and Mathematical Modelling, Department of Mathematical Sciences, North-West University, Mafikeng Campus, Private Bag Box X2046, Mmabatho 2735, South Africa.
3 Department of Mathematics, Çankaya University, Balgat, 06530 Ankara, Turkey.