Case T-186/06: Judgment of the General Court of 16 June 2011 — Solvay v Commission (Competition — Agreements, decisions and concerted practices — Hydrogen peroxide and sodium perborate — Decision finding an infringement of Article 81 EC — Duration of the infringement — Concepts of ‘agreement’ and ‘concerted practice’ — Access to the file — Fines — Leniency Notice — Equal treatment — Legitimate expectations — Obligation to state the reasons on which the decision is based)