SINGH, Shivank; CHAWDA, Rahul kumar. Recent Trends in CAPTCHA Security and Bot Challenges. International Journal of Computer Sciences and Engineering, [S. l.], v. 8, n. 5, p. 123–127, 2020. DOI: 10.26438/ijcse/v8i5.123127. Disponível em: https://ijcse.isroset.org/index.php/j/article/view/6070. Acesso em: 1 feb. 2026.