J. Korean Math. Soc. 1995; 32(3): 625-633
Printed September 1, 1995
Copyright © The Korean Mathematical Society.
Yoon Jae Yoo and En Hee Choi
Kyungpook University and Kyungpook University
1998; 35(1): 11-21
1998; 35(2): 361-370
2007; 44(6): 1233-1241
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