Luo, Songting
Zhao, Hongkai https://orcid.org/0000-0003-2148-238X
Funding for this research was provided by:
Directorate for Mathematical and Physical Sciences (1418422)
Directorate for Mathematical and Physical Sciences (1418908)
Article History
Received: 10 April 2016
Accepted: 29 August 2016
First Online: 14 December 2016