R, K.; S, B.; S, B. S.; J, M. Security System to Prevent Tailgating Using Face Recognition and Ultrasonic Sensor. International Research Journal of Multidisciplinary Technovation, [S. l.], v. 2, n. 5, p. 20–25, 2020. DOI: 10.34256/irjmt2054. Disponível em: https://journals.asianresassoc.org/index.php/irjmt/article/view/327. Acesso em: 3 jul. 2024.