Lou, Yifei
Yan, Ming http://orcid.org/0000-0002-8686-3530
Funding for this research was provided by:
Division of Mathematical Sciences (1522786, 1621798)
Article History
Received: 28 October 2016
Revised: 9 May 2017
Accepted: 17 May 2017
First Online: 29 May 2017