Kowalk, Ulrik, Sven Kissner, Petra von Gablenz, Inga Holube, and Joerg Bitzer. “An Improved Privacy-Aware System for Objective and Subjective Ecological Momentary Assessment”. Proceedings of the International Symposium on Auditory and Audiological Research 6 (January 12, 2018): 25-30B. Accessed March 23, 2019. https://proceedings.isaar.eu/index.php/isaarproc/article/view/2017-04.