Bull. Korean Math. Soc. 2017; 54(2): 417-428
Online first article March 9, 2017 Printed March 31, 2017
https://doi.org/10.4134/BKMS.b150851
Copyright © The Korean Mathematical Society.
Sung Guen Kim
Kyungpook National University
1999; 36(3): 609-619
2011; 48(1): 169-182
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