Bull. Korean Math. Soc. 2017; 54(3): 825-838
Online first article January 10, 2017 Printed May 31, 2017
https://doi.org/10.4134/BKMS.b160323
Copyright © The Korean Mathematical Society.
Indrajit Lahiri and Bipul Pal
University of Kalyani, University of Kalyani
2009; 46(6): 1079-1089
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