Lestari, Andika Setyo Budi Lestari, et al. “PLAN–DO–SEE: Lesson Study-Based Differentiated Learning in Middle Schools”. Delta-Phi: Jurnal Pendidikan Matematika, vol. 1, no. 1, Apr. 2023, pp. 41-45, doi:10.61650/dpjpm.v1i1.76.