Du, Qiang
Ju, Lili
Lu, Jianfang
Funding for this research was provided by:
National Science Foundation (DMS-1719699, DMS-1521965)
Air Force Office of Scientific Research (W911NF-15-1-0562)
China Postdoctoral Science Foundation (2017M610749)
Article History
Received: 13 May 2018
Revised: 5 August 2018
Accepted: 24 August 2018
First Online: 8 September 2018