Jannah, Sella Miftahul, dan Aan Hendrayana. 2023. “Analysis of students’ Mathematical Concept Understanding Ability in Learning After Covid-19 Pandemic at SMPN 1 Anyar”. Math Didactic: Jurnal Pendidikan Matematika 9 (1), 86-97. https://doi.org/10.33654/math.v9i1.1991.