Sudin Mandal
(1), Injamam Ul Karim
(2), Swapan Raha
(3)
(1)
Department of Mathematics, Visva-Bharati, Santiniketan, West-Bengal, India-731235,, India,
(2)
Department of Mathematics, Visva-Bharati, Santiniketan, West-Bengal, India-731235,, India,
(3)
Visva-Bharati(, a Central University), India