Bao, Gang
Gao, Yixian
Li, Peijun
Funding for this research was provided by:
National Science Foundation (DMS-1151308)
National Natural Science Foundation of China (11621101)
National Natural Science Foundation of China (91630309)
National Natural Science Foundation of China (11421110002)
National Science Foundation (11571065)
National Science Foundation (11671071)
Article History
Received: 12 October 2016
Accepted: 14 February 2018
First Online: 27 February 2018