Personalization improves gamification: evidence from a mixed-methods study - Rodrigues, Luiz Antonio Lima; Palomino, Paula Toledo; Toda, Armando Maciel; Klock, Ana Carolina Tomé; Santos, Wilk Oliveira dos; Santos, Anderson Paulo Avila; Gasparini, Isabela; Isotani, Seiji (Proceedings of the ACM on Human-Computer Interaction, 2021)