Serious games 4th Joint International Conference, JCSG 2018, Darmstadt, Germany, November 7-8, 2018 : proceedings - Göbel, Stefan 1971-; Garcia-Agundez, Augusto; Tregel, Thomas; Ma, Minhua; Hauge, Jannicke Baalsrud; Oliveira, Manuel; Marsh, Tim; Caserman, Polona (Springer, 2018)