J. Korean Math. Soc. 2008; 45(1): 229-248
Printed January 1, 2008
Copyright © The Korean Mathematical Society.
Songxiao Li
JiaYing University
2014; 51(1): 125-135
2017; 54(2): 627-645
2005; 42(2): 387-403
2006; 43(3): 579-591
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