Bull. Korean Math. Soc. 2015; 52(1): 149-157
Printed January 31, 2015
https://doi.org/10.4134/BKMS.2015.52.1.149
Copyright © The Korean Mathematical Society.
Manseob Lee, Seunghee Lee, and Junmi Park
Mokwon University, Chungnam National University, Chungnam National University
2012; 49(2): 263-270
2018; 55(2): 359-366
-0001; 31(1): 177-184
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