Judgment of the Court of 20 September 2001 in Case C-184/99 (reference for a preliminary ruling from the Tribunal du travail de Nivelles): Rudy Grzelczyk v Centre public d'aide sociale d'Ottignies-Louvain-la-Neuve (Articles 6, 8 and 8a of the EC Treaty (now, after amendment, Articles 12 EC, 17 EC and 18 EC) — Council Directive 93/96/EEC — Right of residence for students — National legislation which guarantees a minimum subsistence allowance only for nationals, persons covered by Regulation (EEC) No 1612/68 and stateless persons and refugees — Foreign student who has met his own living expenses during the first years of his studies)