Some examples would be Chunfa et al., 2006, Feng et al., 2010, Jian-Ying et al., 2009 and Peiliang et al., 2010.
Algunos ejemplos son: Chunfa et al. 2006, Feng et al. 2010, Jian-Ying et al. 2009, Peiliang et al. 2010.