Commun. Korean Math. Soc. 2008; 23(3): 413-420
Printed September 1, 2008
Copyright © The Korean Mathematical Society.
Uday Chand De and Biman Kanti De
University of Kalyani, Rampur High school
2020; 35(2): 603-611
2011; 26(4): 623-634
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