Luis von Ahn et al., “reCAPTCHA: HumanBased Character Recognition via Web Security Measures”, Science, September 12, 2008, pp. 1465–68.
197
Luis von Ahn, “Massive-Scale Online Collaboration”, TED talk, April 2011, http://www.ted.com/talks/luis_von_ahn_massive_scale_online_collabo ration.html
198
Christopher Mims, “Translating the Web While You Learn”, MIT Technology Review, May 2, 2011, http://www.technologyreview.com/ news/423894/translating-the-web-while-you-learn/
