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Ramaiah, C., Plamondon, R., & Govindaraju, V. (août 2015). A sigma-lognormal model for character level CAPTCHA generation [Communication écrite]. 13th International Conference on Document Analysis and Recognition (ICDAR 2015), Tunis, Tunesia. Lien externe
Ramaiah, C., Plamondon, R., & Govindaraju, V. (juin 2013). Handwritten CAPTCHA generation based on the Sigma-Lognormal model [Communication écrite]. 16th Biennial Conference of the Graphonomics Society (IGS 2013), Nara, Japon. Lien externe