Judgment of the Court (Eighth Chamber) of 5 February 2015.#H.J. Mertens v Raad van bestuur van het Uitvoeringsinstituut werknemersverzekeringen.#Request for a preliminary ruling from the Centrale Raad van Beroep.#Reference for a preliminary ruling — Social security — Regulation (EEC) No 1408/71 — Article 71 — Concept of a ‘partially unemployed frontier worker’ — Refusal of the Member State of residence and of the competent Member State to grant unemployment benefit.#Case C-655/13. Judgment of the Court (Eighth Chamber) of 5 February 2015