Ningsih, Febria, Dela Mike Pitri, and Rahmi Putri. “Analysis of Students’ Higher Order Thinking Skills in Solving Open-Ended Problems on the Topic of the System of Linear Equations in Two Variables”. MATH-EDU: Jurnal Ilmu Pendidikan Matematika 10, no. 2 (August 31, 2025): 147–159. Accessed January 10, 2026. http://jurnal.unimor.ac.id/JIPM/article/view/6351.