Denisova, A. , Guckelsberger, C. & Zendle, D. (2017). Challenge in Digital Games: Towards Developing a Measurement Tool. In: Proceedings of the 2017 CHI Conference Extended Abstracts on Human Factors in Computing Systems. (pp. 2511-2519). New York, USA: ACM Press. doi: 10.1145/3027063.3053209