SINGH, Charanjeet; SINGH, Tripat Deep. A Systemic Review of Various Multifactor Authentication Schemes. International Journal of Computer Sciences and Engineering, [S. l.], v. 7, n. 2, p. 503–510, 2019. DOI: 10.26438/ijcse/v7i2.503510. Disponível em: https://ijcse.isroset.org/index.php/j/article/view/4351. Acesso em: 1 feb. 2026.