Qian, Guang-Rui
Niu, Haiyang
Hu, Chao-Hao
Oganov, Artem R.
Zeng, Qingfeng
Zhou, Huai-Ying
Article History
Received: 8 April 2015
Accepted: 29 March 2016
First Online: 19 May 2016
Competing interests
: The authors declare no competing financial interests.