Picca, Davide, Dominique Jaccard, and Gérald Eberlé. “Natural Language Processing in Serious Games: A State of the Art.”. International Journal of Serious Games 2, no. 3 (September 18, 2015). Accessed August 21, 2019. http://journal.seriousgamessociety.org/index.php/IJSG/article/view/87.