1. Department of Information Science and Engineering, Acharya Institute of Technology, Bengaluru 560 107, Karnataka, India
2. Department of Mathematics, University of Alba Iulia, 510009 Alba-Iulia, Romania
3. School of Mathematics, Alliance University, Central Campus, Chikkahadage Cross, Chandapura-Anekal Main Road, Bengaluru 562 106, India
4. Department of Mathematics, Tehnical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
5. Department of Mathematics, “Mircea cel Batran”, Naval Academy, 900218 Constanta, Romania