J. Castro Filho, J. Castro, M. Souza, R. Freire, and G. Nascimento.
" The Kingdom of Aljabar: the challenge of the two-plate scale: A Digital Educational Resource to Favor the Development of Algebraic Thought", in <em>Workshops Proceedings of the 10th Brazilian Congress on Computers in Education</em>, Online, 2020, pp. 197-204, doi: <a href="https://doi.org/10.5753/wcbie.2021.218536">https://doi.org/10.5753/wcbie.2021.218536</a>.