Bull. Korean Math. Soc. 2009; 46(6): 1221-1228
Printed November 1, 2009
https://doi.org/10.4134/BKMS.2009.46.6.1221
Copyright © The Korean Mathematical Society.
Seongil Park, Byung Hak Kim, Jin Hyuk Choi, and Young Ok Lee
Kyung Hee University, Kyung Hee University, Kyung Hee University, and Kyung Hee University
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