1. Mehrabian, A.: Silent messages: Implicit Communication of Emotions and Attitudes. Wadsworth Publishing Co Inc., Belmont (1981)
2. Eagle, N., Pentland, A.: Reality mining: Sensing complex social signales. J. of Personal and Ubiquitous Computing 10(4), 255–268 (2006)
3. Wittenburg, P., Brugman, H., Russel, A., Klassmann, A., Sloetjes, H.: Elan: A professional framework for multimodality research. In: Proc. of the Fifth International Conference on Language Resources and Evaluation (LREC), pp. 879–896 (2006)
4. Kipp, M.: Anvil: The video annotation research tool. In: Handbook of Corpus Phonology. Oxford University Press, Oxford (2013)
5. Schmidt, T.: Transcribing and annotating spoken language with exmaralda. In: Proc. of the LREC-Workshop on XML Based Richly Annotated Corpora, Lisbon 2004, pp. 879–896. ELRA, Paris (2004)