Nanthanasub, Thanit http://orcid.org/0000-0003-3076-0839
Novaprateep, Boriboon
Wichailukkana, Narongpol
Funding for this research was provided by:
Center of Excellence in Mathematics
Article History
Received: 16 July 2019
Accepted: 22 August 2019
First Online: 3 September 2019
Competing interests
: The authors declare that they have no competing interests.