D. Quercia, R. Schifanella, and L. Aiello. Proceedings of the 25th ACM Conference on Hypertext and Social Media, page 116--125. New York, NY, USA, ACM, (2014)
D. Herzog, H. Massoud, and W. Wörndl. Proceedings of the 25th Conference on User Modeling, Adaptation and Personalization, page 67--75. New York, NY, USA, ACM, (2017)