Luis von Ahn. Three human computation projects. In Thomas J. Cortina, Ellen Lowenfeld Walker, Laurie A. Smith King, David R. Musicant, editors, Proceedings of the 42nd ACM technical symposium on Computer science education, SIGCSE 2011, Dallas, TX, USA, March 9-12, 2011. pages 691-692, ACM, 2011. [doi]
Abstract is missing.