Commun. Korean Math. Soc. 2012; 27(2): 233-242
Printed June 1, 2012
https://doi.org/10.4134/CKMS.2012.27.2.233
Copyright © The Korean Mathematical Society.
Sun Shin Ahn, Young Hie Kim, and Jung Mi Ko
Dongguk University, Myongji University, Gangneung-Wonju National University
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