Bull. Korean Math. Soc. 2001; 38(3): 463-473
Printed September 1, 2001
Copyright © The Korean Mathematical Society.
Yong Ju Kim, Kil Hyun Kwon, and Jeong Keun Lee
KAIST, KAIST, Sunmoon university
2018; 55(3): 749-762
2004; 41(3): 559-571
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