Liang, Guanxiang
Malmuthuge, Nilusha
Guan, Yongjuan
Ren, Yuwei
Griebel, Philip J.
Guan, Le Luo
Article History
Received: 4 September 2015
Accepted: 8 April 2016
First Online: 22 April 2016
Competing interests
: The authors declare no competing financial interests.