Liu, D., L. Barba-Guamán, P. Valdiviezo-Díaz, and G. Riofrio. “Intelligent Tutoring Module for a 3Dgame-Based Science E-Learning Platform”. Inteligencia Artificial, vol. 20, no. 60, Feb. 2017, pp. 1-19, doi:10.4114/intartif.vol20iss60pp1-19.