Commun. Korean Math. Soc. 1999; 14(2): 425-428
Printed June 1, 1999
Copyright © The Korean Mathematical Society.
Dug Hun Hong
Catholic University of Taegu-Hyosung
1998; 13(1): 151-158
1998; 13(2): 377-384
1998; 13(4): 855-863
2003; 18(3): 551-558
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