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