P. Sousa and F. Abreu.
" A Software Estimation Approach Based on Productivity by Use Case Category", in <em>Proceedings of the 10th Brazilian Symposium on Software Quality</em>, Curitiba, 2011, pp. 361-368, doi: <a href="https://doi.org/10.5753/sbqs.2011.15407">https://doi.org/10.5753/sbqs.2011.15407</a>.