Jing, Xiaobo
Huang, Xiangya
Haapasalo, Markus
Shen, Ya
Wang, Qi
Funding for this research was provided by:
Canada Foundation for Innovation (32623)
NSF | Directorate for Mathematical & Physical Sciences | Division of Mathematical Sciences (DMS-1517347)
National Natural Science Foundation of China (11571032, 91630207)
Article History
Received: 3 May 2018
Accepted: 28 November 2018
First Online: 28 January 2019
Competing Interests
: The authors declare no competing interests.