Bull. Korean Math. Soc. 2011; 48(3): 647-653
Printed May 1, 2011
https://doi.org/10.4134/BKMS.2011.48.3.647
Copyright © The Korean Mathematical Society.
An-Hyun Kim
Changwon National University
2018; 55(2): 367-378
2016; 53(3): 943-957
2001; 38(4): 773-786
2007; 44(2): 281-290
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