J. Madureira <em>et al.</em>" Collaborative Learning in High School through Gamification: An Experience Report", in <em>Proceedings of the 31st Brazilian Symposium on Computers in Education</em>, Online, 2020, pp. 501-510, doi: <a href="https://doi.org/10.5753/cbie.sbie.2020.501">https://doi.org/10.5753/cbie.sbie.2020.501</a>.