Bull. Korean Math. Soc. 2010; 47(1): 159-165
Printed January 1, 2010
https://doi.org/10.4134/BKMS.2010.47.1.159
Copyright © The Korean Mathematical Society.
Hong Rae Cho, Youn Ki Kim, Ern Gun Kwon, and Jin Kee Lee
Pusan National University, Andong National University, Andong National University, and Pusan National University
2021; 58(2): 481-495
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