Commun. Korean Math. Soc. 2012; 27(3): 613-619
Printed September 1, 2012
https://doi.org/10.4134/CKMS.2012.27.3.613
Copyright © The Korean Mathematical Society.
Manseob Lee and Gang Lu
Mokwon University, ShenYang University of Technology
2013; 28(3): 581-587
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