Dong, Hongjie http://orcid.org/0000-0003-2258-3537
Kim, Doyoon
Funding for this research was provided by:
Division of Mathematical Sciences (DMS-1600593, DMS-1056737)
National Research Foundation of Korea (2016R1D1A1B03934369)
Article History
Received: 9 January 2018
Accepted: 30 January 2018
First Online: 9 February 2018