Text, Speech, and Dialogue 21st International Conference, TSD 2018, Brno, Czech Republic, September 11-14, 2018, Proceedings - Sojka, Petr; Sojka, Petr; Horák, Aleš; Horák, Aleš; Kopeček, Ivan; Kopeček, Ivan; Pala, Karel; Pala, Karel (Springer International Publishing : Imprint: Springer, 2018)