Yang, Wei
Huang, Yunqing
Li, Jichun
Funding for this research was provided by:
Directorate for Mathematical and Physical Sciences (DMS-1416742)
National Natural Science Foundation of China (Key Project 91430213)
National Natural Science Foundation of China (Project 11401506)
Article History
Received: 20 October 2015
Revised: 17 November 2015
Accepted: 19 November 2015
First Online: 28 November 2015