Bull. Korean Math. Soc. 2001; 38(1): 65-69
Printed March 1, 2001
Copyright © The Korean Mathematical Society.
Chong-Man Cho and Woo Suk Roh
Hanyang University, Hanyang University
1996; 33(3): 445-453
1998; 35(4): 683-687
2001; 38(4): 663-667
2017; 54(2): 679-686
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