Bull. Korean Math. Soc. 2015; 52(2): 395-408
Printed March 31, 2015
https://doi.org/10.4134/BKMS.2015.52.2.395
Copyright © The Korean Mathematical Society.
Dongseok Kim, Young Soo Kwon, and Jaeun Lee
Kyonggi University, Yeungnam University, Yeungnam University
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