Commun. Korean Math. Soc. 2012; 27(2): 223-231
Printed June 1, 2012
https://doi.org/10.4134/CKMS.2012.27.2.223
Copyright © The Korean Mathematical Society.
Sunghan Bae and Pyung-Lyun Kang
KAIST, Chungnam National University
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