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