
https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/502291/54284_EU_Series_No1_Web_Accessible.pdf

https://blogs.lse.ac.uk/europpblog/2021/10/17/the-army-of-candidates-aspiring-councillors-during-italys-municipal-elections/