Wollermann, C., B. Schröder, and U. Schade Fraunhofer. “Audiovisual Prosody of Uncertainty: An Overview”. Ricerche Di Pedagogia E Didattica. Journal of Theories and Research in Education, vol. 9, no. 1, Jan. 2014, pp. 137-5, doi:10.6092/issn.1970-2221/4295.