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Authors
Rassias, Michael Th.
Yang, Bicheng
Raigorodskii, Andrei
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Funding
Funding for this research was provided by:
National Natural Science Foundation, China (61370186 and 61640222)
Guangdong University of Education, China (2015ARF25)
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Article History
Received: 6 March 2020
Accepted: 30 March 2020
First Online: 6 April 2020
Competing interests
: The authors of the present paper do not have any competing interests.
