Auri Vincenzi <em>et al. </em>2013.
 Evolution of free software based on metrics quality: A case study. In <em>Proceedings of the 9th Brazilian Symposium on Information Systems</em>, May 22, 2013, João Pessoa, Brasil. SBC, Porto Alegre, Brasil, 815-826. DOI: <a href="https://doi.org/10.5753/sbsi.2013.5743">https://doi.org/10.5753/sbsi.2013.5743</a>.