3. The delegation of power referred to in Article 14(5), Article 18(3), Article 31(3), Article 71(1), Article 72(1), Article 74(3) and (4) and Article 78(11) may be revoked at any time by the European Parliament or by the Council. A decision to revoke shall put an end to the delegation of power specified in that decision. It shall take effect on the day following the publication of the decision in the Official Journal of the European Union or at a later date specified therein. It shall not affect the validity of any delegated acts already in force.