Article 4: Period of validity - Commission Implementing Decision of 14 December 2011 on the determination of quantities and the allocation of quotas for substances controlled under Regulation (EC) No 1005/2009 of the European Parliament and of the Council on substances that deplete the ozone layer, for the period 1 January to 31 December 2012 (notified under document C(2011) 9196) (Only the Dutch, English, French, German, Greek, Italian, Polish, Portuguese and Spanish texts are authentic) (2011/873/EU)