Chen, Xiaoyang
Fontenele, Francisco
Xavier, Frederico
Funding for this research was provided by:
National Natural Science Foundation of China (11701427)
the Fundamental Research Funds for the Central Universities
the John William and Helen Stubbs Potter Professorship in Mathematics
Article History
Received: 18 July 2020
Revised: 2 September 2020
Accepted: 7 October 2020
First Online: 5 November 2020