HAJJDIAB, Hassan. Random Image Matching CAPTCHA System. ELCVIA Electronic Letters on Computer Vision and Image Analysis, Cerdayola del Vallès, Spain, v. 16, n. 3, p. 1–13, 2017. DOI: 10.5565/rev/elcvia.1036. Disponível em: https://elcvia.cvc.uab.cat/article/view/v16-n3-hajjdiab. Acesso em: 2 jun. 2025.