Huang, Hsin-Hsiung http://orcid.org/0000-0001-7150-7229
Yang, Jie
Funding for this research was provided by:
Division of Mathematical Sciences (1924792)
Division of Mathematical Sciences (1924859)
Article History
Received: 20 May 2020
Accepted: 5 October 2020
First Online: 28 October 2020
Competing interests
: The authors declare that they have no competing interests.