Gonçalves D de O, Ramos AC, Moreno AL. Manipulative Material or Instrument: What is actually being used in teaching Plane Analytical Geometry. Sigmae [Internet]. 2018 Oct. 9 [cited 2024 May 5];6(2):54-61. Available from: https://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/619