Sukowati BA, Masduki M. Students’ instrumental understanding in solving spatial mathematical problems across levels of mathematical ability. J.Res.Adv.Math.Educ [Internet]. 2024 Oct. 31 [cited 2026 Jan. 21];9(4):273-84. Available from: https://journals2.ums.ac.id/jramathedu/article/view/13832