Qi Ye, Youbin Chen, Bin Zhu. The Robustness of a New 3D CAPTCHA. In Jean-Yves Ramel, Marcus Liwicki, Jean-Marc Ogier, Koichi Kise, Ray Smith, editors, 11th IAPR International Workshop on Document Analysis Systems, DAS 2014, Tours, France, April 7-10, 2014. pages 319-323, IEEE, 2014. [doi]
Abstract is missing.