J. Korean Math. Soc. 1997; 34(1): 237-245
Printed March 1, 1997
Copyright © The Korean Mathematical Society.
Y. Q. Chen, K. S. Ha, and Y. J. Cho
Sichuan University, Pusan National University and Gyeongsang National University
2021; 58(6): 1485-1500
1999; 36(5): 911-921
2004; 41(2): 243-248
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