J. Korean Math. Soc. 2002; 39(3): 397-410
Printed May 1, 2002
Copyright © The Korean Mathematical Society.
Lan Senhua and Liu Lanzhe
Lishui Teachers’ College and Hunan University
2002; 39(6): 899-912
2001; 38(1): 163-176
2007; 44(3): 541-564
2012; 49(4): 829-842
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