Advances in Databases and Information Systems 23rd European Conference, ADBIS 2019, Bled, Slovenia, September 8-11, 2019, Proceedings - Welzer, Tatjana; Welzer, Tatjana; Eder, Johann; Eder, Johann; Podgorelec, Vili; Podgorelec, Vili; Kamišalić Latifić, Aida; Kamišalić Latifić, Aida (Springer International Publishing : Imprint: Springer, 2019)