EFTA Court 10 May 2011, Judgment of the Court of 10 May 2011 in Joined Cases E-4/10, E-6/10 and E-7/10 — Principality of Liechtenstein, Reassur Aktiengesellschaft and Swisscom RE Aktiengesellschaft v EFTA Surveillance Authority (Action for annulment of a decision of the EFTA Surveillance Authority — State aid — Special tax rules applicable to captive insurance companies — Notion of undertaking — Selectivity — Existing aid and new aid — Distortion of competition and effect on trade — Recovery — Legitimate expectations — Legal certainty — Obligation to state reasons)

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