Games and Learning Alliance 8th International Conference, GALA 2019, Athens, Greece, November 27-29, 2019, Proceedings - Liapis, Antonios; Liapis, Antonios; Yannakakis, Georgios N.; Yannakakis, Georgios N.; Gentile, Manuel; Gentile, Manuel; Ninaus, Manuel; Ninaus, Manuel (Springer International Publishing : Imprint: Springer, 2019)