Commun. Korean Math. Soc. 2010; 25(4): 511-522
Printed December 1, 2010
https://doi.org/10.4134/CKMS.2010.25.4.511
Copyright © The Korean Mathematical Society.
Sun Shin Ahn and Gyeong Ho Han
Dongguk University, Dongguk University
2016; 31(3): 451-460
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