An Exploratory Study on the Use of Collaborative Riding Based on Gamification as a Support to Public Transportation. - Vaninha Vieira; Adriano Fialho; Victor Martinez; Jailson Brito; Lincoln Brito; Adolfo Duran (SBSC, 2012)

Towards a Framework for Gamification Design on Crowdsourcing Systems: The G.A.M.E. Approach. - Jailson Brito; Vaninha Vieira; Adolfo Duran (ITNG, 2015)