S. Joaquim and W. Oliveira.
" Teaching Mathematical Operations Using Digital Games in Elementary School", in <em>Proceedings of the 26th Workshop on Computing at School</em>, Evento Online, 2020, pp. 71-80, doi: <a href="https://doi.org/10.5753/cbie.wie.2020.71">https://doi.org/10.5753/cbie.wie.2020.71</a>.