Judgment of the Court (First Chamber) of 24 January 2019.#Raad van bestuur van de Sociale verzekeringsbank v D. Balandin and Others.#Request for a preliminary ruling from the Centrale Raad van Beroep.#Reference for a preliminary ruling — Social security — Regulation (EU) No 1231/2010 — Applicable legislation — A1 certificate — Article 1 — Extension of A1 certificate to nationals of third countries residing legally in the territory of a Member State — Legal residence