Ningsih, F., Pitri, D. M. and Putri, R. (2025) “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(2), pp. 147–159. doi: 10.32938/jipm.v10i2.6351.