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Winanda DR, Hanifah, Susanta A. Development of APOS Model Student Worksheet Assisted by GeoGebra on Line and Angle Material Representation in Mathematics in Junior High School. J.Math.Instr.Soc.Res.Opin. [Internet]. 2026 Oct. 25 [cited 2026 Oct. 26];5(3):2537–2550. Available from: https://journal-gehu.com/index.php/misro/article/view/2000