J. Korean Math. Soc. 1995; 32(2): 171-181
Printed June 1, 1995
Copyright © The Korean Mathematical Society.
Chan Gyu Jang and Sik Lee
Chonbuk National University and Chonbuk National University
1995; 32(3): 371-387
1996; 33(4): 709-716
2008; 45(3): 883-902
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