P. Lessel, M. Müller, and A. Krüger. Proceedings of the 33rd Annual ACM Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '15), Seoul, Republic of Korea, page 1809--1814. New York, ACM, (2015)
K. Breiner, K. Bizik, T. Rauch, M. Seissler, G. Meixner, and P. Diebold. Human-Computer Interaction: Design and Development Approaches, 14th International Conference, HCI International 2011, Orlando, FL, USA, Proceedings, Part I, 6761, Springer, Heidelberg, (2011)