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- Schuster, Johannes, Helge Jörgens, and Nina Kolleck. 2019. Using Social Network Analysis to Study Twitter Data in the Field of International Agreements. Sage Research Methods Cases Part 2. London: Sage.
- Jörgens, Helge, Nina Kolleck, and Barbara Saerbeck. 2016. Exploring the Hidden Influence of International Treaty Secretariats: Using Social Network Analysis to Analyse the Twitter Debate on the ‘Lima Work Programme on Gender’. Journal of European Public Policy 23 (7):979–998.