A. Baroni and F. Brito e Abreu.
" Formalizing Object-Oriented Design Metrics upon the UML Meta-Model", in <em>Anais do XVI Simpósio Brasileiro de Engenharia de Software</em>, Gramado/RS, 2002, pp. 130-145, doi: <a href="https://doi.org/10.5753/sbes.2002.23943">https://doi.org/10.5753/sbes.2002.23943</a>.