Chen, S. J.
Zhu, W. C.
Yu, Q. L.
Liu, X. G.
Funding for this research was provided by:
National Science Foundation of China (51222401, 51374049 and 51304037)
Key Project of Chinese Ministry of Education (113019A)
Fundamental Research Funds for the Central Universities of China (N120101001 and N140105001)
China–South Africa Joint Research Programme (2012DFG71060)