L. von Ahn, A. Bortz, N. Hopper, and K. O'Neill. Privacy Enhancing Technologies, volume 4258 of Lecture Notes in Computer Science, page 208-222. Springer, (2006)
L. von Ahn, M. Kedia, and M. Blum. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 75--78. New York, NY, USA, ACM Press, (2006)
L. von Ahn, R. Liu, and M. Blum. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 55--64. New York, NY, USA, ACM Press, (2006)
L. von Ahn, and L. Dabbish. Proceedings of the 2004 Conference on Human Factors in Computing Systems, CHI 2004, Vienna, Austria, April 24 - 29, 2004, page 319-326. (2004)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM, (2004)
N. Hopper, J. Langford, and L. von Ahn. Advances in Cryptology -- CRYPTO 2002, volume 2442 of Lecture Notes in Computer Science, page 77--92. Springer, (2002)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM, (2004)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in
computing systems, page 319--326. New York, NY, USA, ACM Press, (2004)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM, (2004)
S. Hacker, and L. von Ahn. CHI '09: Proceedings of the 27th international conference on Human factors in computing systems, page 1207--1216. New York, NY, USA, ACM, (2009)
L. von Ahn, and L. Dabbish. Proceedings of the 2004 Conference on Human Factors in Computing Systems, CHI 2004, Vienna, Austria, April 24 - 29, 2004, page 319-326. (2004)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM, (2004)
L. von Ahn, R. Liu, and M. Blum. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 55--64. New York, NY, USA, ACM, (2006)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM Press, (2004)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM Press, (2004)
L. von Ahn, M. Kedia, and M. Blum. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 75--78. New York, NY, USA, ACM Press, (2006)