http://justfair.org.uk/wp-content/uploads/2019/01/JFothers-submission-WPC-Dec2018-FINAL.pdf
https://www.esri.ie/system/files/publications/RS164.pdf
https://www.ips-journal.eu/topics/future-of-social-democracy/amid-nothing-going-right-austrians-lean-far-left-6750/
https://theconversation.com/los-primeros-usos-de-la-palabra-filosofia-210236