Bull. Korean Math. Soc. 2012; 49(2): 263-270
Printed March 1, 2012
https://doi.org/10.4134/BKMS.2012.49.2.263
Copyright © The Korean Mathematical Society.
Keonhee Lee and Xiao Wen
Chungnam National University, Beihang University
2015; 52(1): 149-157
2018; 55(2): 359-366
-0001; 31(1): 177-184
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