Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Dunkel, Alexander; Andrienko, Gennady; Andrienko, Natalia; Burghardt, Dirk; Hauthal, Eva; Purves, Ross S (2019). A conceptual framework for studying collective reactions to events in location-based social media. International Journal of Geographical Information Science, 33(4):780-804.