DIMMEL, J.; PANDISCIO, E.; BOCK, C. Multiplication by Sunlight: How Can a Geometric Definition Be Realized in a Physical Tool?. **Journal of Mathematics Education at Teachers College**, *[S. l.]*, v. 12, n. 1, p. 9–16, 2021. Disponível em: https://journals.library.columbia.edu/index.php/jmetc/article/view/7573. Acesso em: 27 sep. 2022.