Nuril Azizah, Rizky Wahyu. 2025. “Student’s Mathematical Concept Understanding Ability in the Material of Functions of Class XI of SMA Islam Sabilurrosyad Gasek Malang”. Pasundan Journal of Mathematics Education : Jurnal Pendidikan Matematika 15 (1):81-92. https://doi.org/10.23969/pjme.v15i1.20237.