J. Korean Math. Soc. 2010; 47(6): 1107-1122
Printed November 1, 2010
https://doi.org/10.4134/JKMS.2010.47.6.1107
Copyright © The Korean Mathematical Society.
Zhang Tianping
Shaanxi Normal University
2020; 57(3): 571-583
2006; 43(6): 1199-1217
2007; 44(1): 11-24
2009; 46(4): 733-746
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