J. Korean Math. Soc. 2003; 40(1): 41-60
Printed January 1, 2003
Copyright © The Korean Mathematical Society.
Liu Lanzhe
Hunan University
2007; 44(3): 541-564
2009; 46(3): 577-588
2022; 59(2): 235-254
2021; 58(4): 799-817
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