Judgment of the Court (First Chamber) of 25 October 2001 in Case C-189/00 (reference for a preliminary ruling from the Sozialgericht Trier): Urszula Ruhr v Bundesanstalt für Arbeit (Regulation (EEC) No 1408/71 — Nationals of non-member countries — Members of a worker's family — Rights acquired directly and rights derived through others — Unemployment benefit)