2011/52/EU: Council Decision of 18 January 2011 on the signing, on behalf of the European Union, of the Agreement between the European Union, the Swiss Confederation and the Principality of Liechtenstein amending the Additional Agreement between the European Community, the Swiss Confederation and the Principality of Liechtenstein extending to the Principality of Liechtenstein the Agreement between the European Community and the Swiss Confederation on trade in agricultural products