Court of Justice (First Chamber) 24 January 2019, C-477/17 (Raad van bestuur van de Sociale verzekeringsbank v D. Balandin and Others.)

JUDGMENT OF THE COURT (First Chamber) 24 January 2019 ( *1 ) ( i ) (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 — Concept) In Case C‑477/17, REQUEST for a preliminary ruling