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