KOBZA, Vladimír - JANIŠ, Vladimír. Hesitant distance as a fuzzy metric. In EUROFUSE 2013 : workshop on uncertainty and imprecision modelling in decision making, December 2-4, 2013, Oviedo. 1. vyd. - Oviedo : Universidad de Oviedo, 2013. ISBN 978-84-16046-04-1, s. 145-148.