J. Korean Math. Soc. 2007; 44(6): 1441-1451
Printed November 1, 2007
Copyright © The Korean Mathematical Society.
Yong-Kab Choi, Kyo-Shin Hwang, and Hee-Jin Moon
Gyeongsang National University, Gyeongsang National University, Gyeongsang National University
1996; 33(4): 813-822
1999; 36(3): 509-525
1999; 36(4): 679-697
2004; 41(6): 1023-1034
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