Tillægsoverenskomst om gyldigheden for fyrstendømmet Liechtenstein af overenskomsten mellem Det europæiske Kul- og Stålfællesskab og Schweiz af 22. juli 1972 EFT L 350 19.12.73 s.29.
Additional Agreement concerning the validity, for the Principality of Liechtenstein, of the Agreement between the Member States of the European Coal and Steel Community and the Swiss Confederation of 22 July 1972 OJ L 350 19.12.73 p.29.