Department of Mathematics, Ramakrishna Mission Vivekananda Centenary College, Rahara, West Bengal 700 118, India e-mail: bikashchakraborty.math@yahoo.com, bikashchakrabortyy@gmail.com
Susmita Ghosh
Affiliation:
Directorate of Open and Distance Learning, University of Kalyani, West Bengal 741 245, India e-mail: sumghosh564@gmail.com
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