
https://www.vatican.va/content/leo-xiii/en/encyclicals/documents/hf_l-xiii_enc_15051891_rerum-novarum.html

https://www.socialeurope.eu/pensions-in-switzerland-how-a-rise-was-won

http://www.ips-journal.eu/storage/topics/european-union/article/show/pillar-of-society-2467/