Zeng, W. http://orcid.org/0000-0001-8473-9299
Liu, G. R.
Funding for this research was provided by:
Division of Mathematical Sciences (1214188)
Article History
Received: 27 October 2016
Accepted: 4 November 2016
First Online: 21 November 2016
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This work does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study formal consent is not required..