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Note that “et al.” should only be used after 10 authors. 
Please refer to the following examples:
·Article in a periodical
Hu, C.H., Hu, W.P., Zhang, F.B., Hu, Z.X., Li, X.H., and Chen, Y.G. (2006). Sediment resuspension in Lake Taihu, China. Chin Sci Bull 51, 731–737.
In the text, references should be written as in the following examples: (Zhang, 2003) or (Wang et al., 1999; Hu et al., 2006) or (Norman and
Redfern, 1996) or (Hu et al., 2009a, b).
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