J. Korean Math. Soc. 2011; 48(2): 329-340
Printed March 1, 2011
https://doi.org/10.4134/JKMS.2011.48.2.329
Copyright © The Korean Mathematical Society.
Sun Hyang Chun, Hong Kyung Pak, Jeong Hyeong Park, and Kouei Sekigawa
Sungkyunkwan University, Daegu Haany University, Sungkyunkwan University, Niigata University
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