Zhu, J.
Shu, C.-W.
Funding for this research was provided by:
National Natural Science Foundation of China (11372005)
State Scholarship Fund of China for studying abroad
Army Research Office (W911NF-15-1-0226)
Division of Mathematical Sciences (DMS-1719410)
Article History
Received: 24 August 2017
Revised: 3 May 2018
Accepted: 8 May 2018
First Online: 18 June 2018