Indraswari NF. Snowball throwing based on lesson study to improve college student’s algebraic reasoning in solving problems generating functions. Math Didactic [Internet]. 30 Desember 2022 [dikutip 9 Juli 2025];8(3):242-54. Tersedia pada: https://jurnal.stkipbjm.ac.id/index.php/math/article/view/1932