Cai, Xiaofeng
Zhang, Xiangxiong
Qiu, Jianxian
Funding for this research was provided by:
National Natural Science Foundation of China (91230110)
National Natural Science Foundation of China (11328104)
National Science Foundation (DMS-1522593)
National Natural Science Foundation of China (11571290)
Article History
Received: 12 July 2015
Revised: 16 November 2015
Accepted: 26 November 2015
First Online: 12 December 2015