Bull. Korean Math. Soc. 2015; 52(2): 345-350
Printed March 31, 2015
https://doi.org/10.4134/BKMS.2015.52.2.345
Copyright © The Korean Mathematical Society.
Indrajit Lahiri and Rupa Pal
University of Kalyani, Bethune College
2021; 58(5): 1175-1192
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