F. Pires, K. Teixeira, M. Pessoa, and P. Lima.
" Developing Computational Thinking through Turing Machine: Curupiras enigma", in <em>Proceedings of the 27th Workshop on Computing Education</em>, Belém, 2019, pp. 523-532, doi: <a href="https://doi.org/10.5753/wei.2019.6657">https://doi.org/10.5753/wei.2019.6657</a>.