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

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