Case C-448/11 P: Judgment of the Court (Second Chamber) of 5 December 2013 — SNIA Spa, under special administration v European Commission (Appeal — Agreements, decisions and concerted practices — European market for hydrogen peroxide and sodium perborate — Decision finding an infringement of Article 81 EC — Imputation of liability in the field of competition — Economic continuity test — Infringement of the rights of defence — Duty to state reasons)