Commun. Korean Math. Soc. 2003; 18(2): 225-233
Printed June 1, 2003
Copyright © The Korean Mathematical Society.
Sun Shin Ahn, Keumseong Bang
Dongguk University, The Catholic University of Korea
2013; 28(2): 225-229
1999; 14(4): 687-691
2007; 22(3): 323-330
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