Case C-410/18: Judgment of the Court (First Chamber) of 10 July 2019 (request for a preliminary ruling from the Tribunal administratif — Luxembourg) — Nicolas Aubriet v Ministre de l’Enseignement supérieur et de la Recherche (Reference for a preliminary ruling — Freedom of movement for persons — Equal treatment — Social advantages — Regulation (EU) No 492/2011 — Article 7(2) — Financial aid for higher education studies — Non-resident students — Condition connected with the period of their parents’ working time on national territory — Minimum period of five years — Reference period of seven years — Method of calculation of the reference period — Date of the application for financial aid — Indirect discrimination — Justification — Proportionality)