1. Department of Mathematics, “1 Decembrie 1918” University of Alba Iulia, 510009 Alba Iulia, Romania
2. Institute of Mathematics and Applications, Andharua, Bhubaneswar 751029, Odisha, India
3. Department of Mathematics, College of Science and Arts, Al-Badaya, Qassim University, Buraidah 52571, Saudi Arabia
4. Department of Mathematics, Faculty of Science, Damietta University, New Damietta 34517, Egypt
5. Department of Sciences and Humanities, University College of Engineering Tindivanam, Anna University, Tindivanam 604001, Tamil Nadu, India