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Authors
Liu, Feng http://orcid.org/0000-0002-4177-9845
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Funding
Funding for this research was provided by:
NNSF of China (11701333)
Support Program for Outstanding Young Scientific and Technological Top-notch Talents of College of Mathematics and Systems Science (Sxy2016K01)
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Article History
Received: 25 April 2019
Accepted: 9 October 2019
First Online: 16 October 2019
Competing interests
: The author declares to have no competing interests.
