Lin, Zhiwu http://orcid.org/0000-0002-7342-1805
Xu, Ming
Funding for this research was provided by:
Division of Mathematical Sciences (DMS-1411803, DMS-1715201)
Article History
Received: 2 July 2017
Accepted: 11 September 2018
First Online: 24 September 2018
Compliance with Ethical Standards
:
: There are no conflicts of interest for the research in this paper.