Bull. Korean Math. Soc. 2015; 52(1): 335-344
Printed January 31, 2015
https://doi.org/10.4134/BKMS.2015.52.1.335
Copyright © The Korean Mathematical Society.
Jong Taek Cho
Chonnam National University
2004; 41(4): 699-708
2011; 48(6): 1315-1327
2015; 52(5): 1621-1630
2013; 50(6): 2089-2101
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