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• Current address : Shyamapada Modak: Department of Mathematics, University of Gour Banga P.O. Mokdumpur, Malda - 732103, India
• E-mail address : spmodak2000@yahoo.co.in
• Current address : Md. Monirul Islam: Department of Mathematics, University of Gour Banga P.O. Mokdumpur, Malda - 732103, India
• E-mail address : moni.math007@gmail.com