Tian, J. H.
Song, T.
Sun, X. W.
Wang, T.
Jiang, G.
Funding for this research was provided by:
National Natural Science Foundation of China (11164013)
National Natural Science Foundation of China (11464027)
National Natural Science Foundation of Gansu Province (148RJZA027)
Young Scholars Science Foundation of Lanzhou Jiaotong University (2014022)