Chortip Siwapornanan, Thodsaporn Kumduang, Junlouchai P. Functions Whose Images are Terms of a Weakly Fixed Variable. Sci Tech Asia [internet]. 2025 Jun. 19 [cited 2026 Aug. 26];30(2):38-46. available from: https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/254382