Bull. Korean Math. Soc. 2007; 44(4): 771-775
Printed December 1, 2007
Copyright © The Korean Mathematical Society.
Tariq Shah
Quaid-i-Azam University
2018; 55(4): 1007-1012
2018; 55(2): 649-657
2011; 48(2): 365-375
2012; 49(3): 601-608
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