Hu, Jingwei
Zhang, Xiangxiong
Funding for this research was provided by:
Directorate for Mathematical and Physical Sciences (1620250, 1522593)
Directorate for Mathematical and Physical Sciences (1107291, 1654152)
Article History
Received: 14 February 2017
Revised: 29 June 2017
Accepted: 10 July 2017
First Online: 17 July 2017