REEVES, Neal; WEST, Peter; SIMPERL, Elena. "A Game Without Competition Is Hardly a Game": The Impact of Competitions on Player Activity in a Human Computation Game". Proceedings of the AAAI Conference on Human Computation and Crowdsourcing, [S. l.], v. 6, n. 1, p. 154–163, 2018. DOI: 10.1609/hcomp.v6i1.13329. Disponível em: https://ojs.aaai.org/index.php/HCOMP/article/view/13329. Acesso em: 13 may. 2026.