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Captchas

A. Rusu, A. Thomas, and V. Govindaraju, “Generation and use of handwritten CAPTCHAs”, International Journal of Document Analysis and Recognition, Vol. 13, pp. 49-64, 2010. pdf
A. O. Thomas, A. Rusu, and V. Govindaraju, “Synthetic Handwritten CAPTCHAs”, The Journal of Pattern Recognition, Special Issue on Handwriting Recognition, Elsevier Press, 2009. pdf