BARBU, I.-D.; PETRICĂ, G. Multifactor Authentication. International Conference on Cybersecurity and Cybercrime, [S. l.], v. 1, p. 5–8, 2014. DOI: 10.19107/CYBERCON.2014.01. Disponível em: https://proceedings.cybercon.ro/index.php/ic3/article/view/2014-01. Acesso em: 30 jul. 2026.