Barz, M. , Altmeyer, K. , Malone, S. , Lauer, L. , & Sonntag, D. . (2020). Digital Pen Features Predict Task Difficulty and User Performance of Cognitive Tests. In T. Kuflik, Torre, I. , Burke, R. , & Gena, C. (Hrsg.), Proceedings of the 28th ACM Conference on User Modeling, Adaptation and Personalization (S. 23-32). New York: ACM.