Patterns of Negative Campaigning during the 2019 European Election: Political Parties' Facebook Posts and Users' Sharing Behaviour across Twelve Countries. - Baranowski, Paweł; Kruschinski, Simon; Russmann, Uta; Haßler, Jörg; Magin, Melanie; Márton, Bene; Ceron, Andrea; Jackson, Daniel; Lilleker, Darren (Journal of Information Technology & Politics, 2023)