Judgment of the Court of 28 April 1998.#Nicolas Decker v Caisse de maladie des employés privés.#Reference for a preliminary ruling: Conseil arbitral des assurances sociales - Grand Duchy of Luxemburg.#Free movement of goods - Articles 30 and 36 of the EC Treaty - Reimbursement of medical expenses incurred in another Member State - Prior authorisation of the competent institution - Purchase of spectacles.#Case C-120/95.

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