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.
Lengauer, G; Esser, F; Berganza, R (2012). Negativity in political news: A review of concepts, operationalizations and key findings. Journalism, 13(2):179-202.