Wiwatanapataphee, Doungporn
Khajohnsaksumeth, Nathnarong http://orcid.org/0000-0002-8087-8803
Wu, Yong Hong
Funding for this research was provided by:
Centre of Excellence in Mathematics, Commission on Higher Education (2)
The 2018 SAE summer scholarship from the faculty of Science and Engineering (1)
Article History
Received: 2 February 2019
Accepted: 27 May 2019
First Online: 11 June 2019
Competing interests
: The authors declare that they have no competing interests.