Zhao et al. | 2006 | 29 | 116 |
Liang et al. | 2006 | 133 | 122 |
Ma et al. | 2006 | 88 | 75 |
Xie et al. | 2006 | 78 | 100 |
Wang et al. | 2006 | 201 | 360 |
Xu.et al. | 2007 | 52 | 60 |
Chu et al. | 2007 | 329 | 220 |
Wang et al. | 2007 |
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Ding et al. | 2008 | 52 | 110 |
Ma et al. | 2011 | 88 | 75 |