The Journal of King Mongkut's University of Technology North Bangkok
วารสารวิชาการพระจอมเกล้าพระนครเหนือ

Salinthip Daengkongkho
Department of Mathematics, Faculty of Science and Technology, Pibul class="nav nav-list"ongkram Rajabhat University, Phitsanuloke 65000
Thailand

Pairote Yiarayong
Department of Mathematics, Faculty of Science and Technology, Pibul class="nav nav-list"ongkram Rajabhat University, Phitsanuloke 65000
Thailand