1. Apostolou, J. (2014). E-participation: The case of online-based participatory budgeting processes in Germany. Central and Eastern European E-Gov Days 2014: E-Government: Driver or Stumbling Block for European Integration. Conference Proceedings, 183–197.
2. Apostolou, J. (forthcoming). Municipal finances and adoption of participatory budgeting in Germany—An empirical analysis of adoption patterns from a political economy perspective.
3. Banner, G. (1999). Die drei Demokratien der Bürgerkommune. In H. H. Arnim (Ed.), Adäquate Institu-tionen—Voraussetzungen für eine “gute” und bürgernahe Politik (pp. 133–162). Speyer.
4. Bertelsmann Foundation. (n.d.). Essen—Finanzen—2016–2018—Statistische Daten. Retrieved April 27, 2021, from https://www.wegweiser-kommune.de/statistik/essen+finanzen+2016-2018+tabelle
5. Boulding, C., & Wampler, B. (2010). Voice, votes, and resources: Evaluating the effect of participatory democracy on well-being. World Development, 38(1), 125–135. https://doi.org/10.1016/j.worlddev.2009.05.002