Ulfania Julisa, et al. “Development of Contextual-Based Mathematics Teaching Materials to Facilitate students’ Mathematical Problem-Solving Ability on Systems of Linear Inequalities in Two Variables”. Jurnal Absis: Jurnal Pendidikan Matematika Dan Matematika, vol. 9, no. 1, Apr. 2026, pp. 259-72, doi:10.30606/absis.v9i1.4132.