J. Korean Math. Soc. 2019; 56(4): 917-934
Online first article May 29, 2019 Printed July 1, 2019
https://doi.org/10.4134/JKMS.j180473
Copyright © The Korean Mathematical Society.
Yaning Wang
Henan Normal University
1997; 34(3): 633-651
2002; 39(1): 149-161
2010; 47(2): 299-309
2011; 48(1): 23-31
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