1. Assistant Professor, Dept. of Mathematics, National Institute of Technology Jamshedpur, Jamshedpur, Jharkhand 831014, India; presently, Dept. of Mathematics, Triveni Devi Bhalotia College, Raniganj, West Bengal 713347, India.
2. Assistant Professor, Dept. of Mathematics, National Institute of Technology Jamshedpur, Jamshedpur, Jharkhand 831014, India (corresponding author). ORCID: .