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EUR-Lex -  61988CJ0029 - EN - Judgment of the Court (Second Chamber) of 28 February 1989. - Wilhelm Schmitt v Bundesversicherungsanstalt für Angestellte. - Reference for a preliminary ruling: Sozialgericht Hamburg - Germany. - Article 51 of the EEC Treaty - Possibility of back-paying contributions to a pension insurance scheme. - Case 29/88.