Affiliations: Manoj Dhake, Department of Mathematics, S. P. Pune University, Ganeshkhind Rd, Pune, Maharashtra 411007, India, e-mail: manojdhake2012@gmail.com; Sachin Ballal (corresponding author), School of Mathematics and Statistics, University of Hyderabad, Hyderabad Central University Rd, Hyderabad, Telangana, 500046, India, e-mail: sachinballal@uohyd.ac.in; Vilas Kharat, Rupesh S. Shewale, Department of Mathematics, S. P. Pune University, Ganeshkhind Rd, Pune, Maharashtra 411007, India, e-mail: laddoo1@yahoo.com, rsshewale@gmail.com