Court of Justice 13 April 2000, C-135/99 (Ursula Elsen v Bundesversicherungsanstalt für Angestellte.)

Opinion of the Advocate-General Opinion of the Advocate-General 1. By an order lodged on 19 April 1999, the Bundessozialgericht (Federal Social Court) (Germany) referred a question to the Court for a preliminary ruling in a dispute between a migrant worker and the German social security administration on the question whether, for the purposes of the grant of an old-age pension, a period during