J. Colombini and F. Siqueira.
" A Proposal for a Concrete Syntax for Use Case", in <em>Companion Proceedings of the 17th Brazilian Symposium on Information Systems</em>, On-line, 2021, pp. 45-48, doi: <a href="https://doi.org/10.5753/sbsi.2021.15353">https://doi.org/10.5753/sbsi.2021.15353</a>.