Chotikar Vuthisar
<p>Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Rangsit Campus,<br />Pathum-Thani</p>
Thailand

Ramidha Srihera
<p>Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Rangsit Campus,<br />Pathum-Thani</p>
Thailand

Patchanok Srisuradetchai
<p>Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Rangsit Campus,<br />Pathum-Thani</p>
Thailand