pid type title authors mentors source_title published_date url doi isbn issn eissn foi:7511 thesis "Analiza podataka o digitalnoj ekonomiji i društvu u zemljama Europske unije" "Kristanović, Nikola" infri:1032 "conference paper" "Topic modelling and sentiment analysis of COVID-19 related news on Croatian Internet portal" "Buhin Pandur, Maja; Dobša, Jasminka; Beliga, Slobodan; Meštrović, Ana"