Case C-449/11 P: Judgment of the Court (Second Chamber) of 5 December 2013 — Solvay Solexis SpA 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 — Concepts of ‘agreement’ and ‘concerted practice’ — Concept of a ‘single and continuous infringement’ — Calculation of the fine)