Qiu, Yangqing http://orcid.org/0000-0002-7011-8683
Fang, Hong
Funding for this research was provided by:
the key discipline (Applied Mathematics) of Shanghai Polytechnic University (XXKPY1604)
Article History
Received: 22 May 2018
Revised: 4 July 2019
Accepted: 15 July 2019
First Online: 7 August 2019
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: All authors contributed equally and significantly in writing this paper. All authors read and approved the final manuscript.