M. El Uri and D. Kreutz.
" PDFWebSigner: posicionamento de estampas de assinaturas digitais em documentos PDF", in <em>Proceedings of the 20th Regional School of Computer Networks</em>, Porto Alegre/RS, 2023, pp. 151-156, doi: <a href="https://doi.org/10.5753/errc.2023.930">https://doi.org/10.5753/errc.2023.930</a>.