J. Korean Math. Soc. 1996; 33(4): 735-745
Printed December 1, 1996
Copyright © The Korean Mathematical Society.
Seung Ahn Park and Eunmi Choi
Sogang University and Hannam University
2017; 54(3): 909-943
2016; 53(5): 1019-1036
1996; 33(2): 387-397
2000; 37(4): 565-577
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