ANUSHA, M.; KAVITHA, V.; LEKHANA, S. P.; SAHANA, M. S.; SUSHMA, A. Multilevel Authentication sing OTP, QR-Code and Hadamard Transformation. International Journal of Research in Engineering, Science and Management, [S. l.], v. 3, n. 8, p. 44–46, 2020. Disponível em: https://journal.ijresm.com/index.php/ijresm/article/view/120.. Acesso em: 6 may. 2024.