1. Department of Studies and Research in Mathematics, Tumkur University 1 , Tumkur 572103, Karnataka, India
2. Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University) 2 , Bengaluru 560029, India
3. Department of Mathematics, Cankaya University 3 , Balgat, 06530 Ankara, Turkey
4. Institute of Space Sciences 4 , Magurele, Bucharest R76900, Romania