Case C-477/17: Judgment of the Court (First Chamber) of 24 January 2019 (request for a preliminary ruling from the Centrale Raad van Beroep — Netherlands) — Raad van bestuur van de Sociale Verzekeringsbank v D. Balandin, I. Lukachenko, Holiday on Ice Services BV (Reference for a preliminary ruling — Social security — Regulation (EU) No 1231/2010 — Applicable legislation — A1 certificate — Article 1 — Extension of coordination of social security systems to citizens of third countries residing legally in the territory of a Member State — Legal residence — Concept)