JACKULIN.C, R.SHALINI, K. D. K. A Secure Pin Authentication Method against Shoulder Surfing Attacks. International Journal of Engineering and Computer Science, india, v. 5, n. 10, 2018. Disponível em: http://ijecs.in/index.php/ijecs/article/view/2730. Acesso em: 3 may. 2024.