Geiser Challco, Fernando Andrade, Tamires Oliveira, Riichiro Mizoguchi, and Seiji Isotani. 2015.
 An Ontological Model to Apply Gamification as Persuasive Technology in Collaborative Learning Scenarios. In <em>Anais do XXVI Simpósio Brasileiro de Informática na Educação</em>, outubro 26, 2015, Maceió/AL, Brasil. SBC, Porto Alegre, Brasil, 499-508. DOI: <a href="https://doi.org/10.5753/cbie.sbie.2015.499">https://doi.org/10.5753/cbie.sbie.2015.499</a>.