<a href="https://www.buergerhaushalt.org/sites/default/files/downloads/Studie_Hope_for_democracy_-_25_years_of_participatory_budgeting_worldwide.pdf">https://www.buergerhaushalt.org/sites/default/files/downloads/Studie_Hope_for_democracy_-_25_years_of_participatory_budgeting_worldwide.pdf</a>
