Bar de Figueiredo E, Kieckhoefel DEN, Hänsch JE. Can the sandwiches be split? The semiotic representation registers and concrete materials in teacher training. RPEM [Internet]. 2025 Aug. 31 [cited 2026 Oct. 13];14(34). Available from: https://periodicos-hml.unespar.edu.br/rpem/article/view/10083