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Haichang, Gao and Liu, Honggang and Yao, Dan and Liu, Xiyang and Aickelin, Uwe (2010) An audio CAPTCHA to distinguish humans from computers. In: Third International Symposium on Electronic Commerce and Security, ISECS2010: Guangzhou, China, 29-31 July 2010. IEEE Computer Society, Los Alamos, Calif., pp. 265-269.