Bull. Korean Math. Soc. 2013; 50(5): 1539-1554
Printed September 1, 2013
https://doi.org/10.4134/BKMS.2013.50.5.1539
Copyright © The Korean Mathematical Society.
Zhenlong Gao and Liang Fang
Qufu Normal University, Hunan Normal University
2018; 55(1): 9-23
2013; 50(2): 375-388
1997; 34(2): 233-245
1998; 35(2): 279-292
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