
https://theconversation.com/are-europeans-really-democrats-211457

https://yougov.co.uk/news/2017/04/26/voting-intention-conservatives-45-labour-29-25-26-/

http://www.europarl.europa.eu/RegData/etudes/etudes/join/2013/493010/IPOL-FEMM_ET(2013)493010_EN.pdf?utm_source=POLITICO.EU