Daniel Brahm, Sandro Fernandes, and João Bellomo Filho. 2001.
 Certificação de Firewalls. In <em>Proceedings of the 1st Workshop on Computer Systems Security</em>, March 05, 2001, Florianópolis, Brasil. SBC, Porto Alegre, Brasil, 1-7. DOI: <a href="https://doi.org/10.5753/sbseg.2001.21277">https://doi.org/10.5753/sbseg.2001.21277</a>.