Chortip Siwapornanan, Thodsaporn Kumduang, and Prapairat Junlouchai. 2025. “Functions Whose Images are Terms of a Weakly Fixed Variable”. Science & Technology Asia 30 (2):38-46. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/254382.