Strnadová V., Voborník P., Provazníková K.: Social communication analysis of virtual communities on social networks. In: 13th International Technology, Education and Development Conference (INTED 2019) Proceedings. Valencia, Spain 11-13 March, IATED Academy, 2019, pp. 3184-3192, ISBN 978-84-09-08619-1, ISSN 2340-1079.