FDFA, Treaty database, Administrative Arrangement for the implementation of the Agreement between the Swiss Confederation and the United States of America on social security ([Internet, 2017-05-16](https://www.eda.admin.ch/eda/en/home/foreign-policy/international-law/internationale-vertraege/datenbank-staatsvertraege/detailansicht-staatsvertrag.ggst0_83.contract20141236.html))