Bull. Korean Math. Soc. 2009; 46(3): 567-576
Printed May 1, 2009
https://doi.org/10.4134/BKMS.2009.46.3.567
Copyright © The Korean Mathematical Society.
Miekyung Choi, Young Ho Kim, and Gi-Chan Park
Kyungpook National University
2015; 52(5): 1569-1578
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