J. Martina <em>et al.</em>" Certificado Digital Acadêmico na Nuvem", in <em>Proceedings of the 9th Workshop on Digital Identity Management</em>, São Paulo, 2019, pp. 19-20, doi: <a href="https://doi.org/10.5753/wgid.2019.14023">https://doi.org/10.5753/wgid.2019.14023</a>.