Commun. Korean Math. Soc. 2009; 24(4): 561-564
Printed December 1, 2009
https://doi.org/10.4134/CKMS.2009.24.4.561
Copyright © The Korean Mathematical Society.
Pil Lan Kim, Ern Gun Kwon, and Jong Hee Park
Andong National University, Andong National University, and Andong National University
2021; 36(4): 651-669
2006; 21(2): 287-292
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