The Member States 26 February 2001, Treaty of Nice amending the Treaty on European Union, the Treaties establishing the European Communities and certain related acts#Part 2 – Transitional and Final Provisions#Article 12

12001C012 Treaty of Nice amending the Treaty on European Union, the Treaties establishing the European Communities and certain related acts - Part 2 – Transitional and Final Provisions - Article 12 Official Journal 080 , 10/03/2001 P. 0043 - 0043 Article 12 1. This Treaty shall be ratified by the High Contracting Parties in accordance with their respective constitutional requirements.