https://theconversation.com/tres-preguntas-sobre-la-amnistia-claves-para-el-futuro-de-espana-216937
https://www.lobbycontrol.de/parteienfinanzierung/parteispenden-deutschland-ist-das-intransparenteste-land-in-europa-115718/
https://www.ips-journal.eu/topics/democracy-and-society/the-berlin-blob-7462/