J. Korean Math. Soc. 1995; 32(3): 371-387
Printed September 1, 1995
Copyright © The Korean Mathematical Society.
Hyang Kam Cho and Moo Ha Woo
Korea University and Korea University
1995; 32(2): 171-181
1996; 33(4): 709-716
2008; 45(3): 883-902
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