Treaty between the Kingdom of Belgium, the Kingdom of Denmark, the Federal Republic of Germany, the Hellenic Republic, the Kingdom of Spain, the French Republic, Ireland, the Italian Republic, the Grand Duchy of Luxembourg, the Kingdom of The Netherlands, the Portuguese Republic, the United Kingdom of Great Britain and Northern Ireland (Member States of the European Union) and the Kingdom of Norway, the Republic of Austria, the Republic of Finland, the Kindom of Sweden concerning the accession of the Kingdom of Norway, the Republic of Austria, the Republic of Finland and the Kingdom of Sweden to the European Union