Yu, Shuyin
Jia, Xiaojing
Frapper, Gilles
Li, Duan
Oganov, Artem R.
Zeng, Qingfeng
Zhang, Litong
Article History
Received: 10 May 2015
Accepted: 4 November 2015
First Online: 2 December 2015
Competing interests
: The authors declare no competing financial interests.