Bull. Korean Math. Soc. 2016; 53(2): 373-386
Printed March 31, 2016
https://doi.org/10.4134/BKMS.2016.53.2.373
Copyright © The Korean Mathematical Society.
Seon-Hong Kim and Jung Hee Lee
Sookmyung Women's University, Sookmyung Women's University
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