J. Korean Math. Soc. 1996; 33(2): 235-247
Printed June 1, 1996
Copyright © The Korean Mathematical Society.
Sung Hee Choi and Bum Il Hong
Sun Moon University and Kyung Hee University
1996; 33(3): 541-555
1997; 34(3): 661-672
2001; 38(6): 1235-1243
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