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EUR-Lex -  61976CJ0104 - EN - Judgment of the Court of 5 May 1977. - Gerda Jansen v Landesversicherungsanstalt Rheinprovinz. - Reference for a preliminary ruling: Landessozialgericht Nordrhein-Westfalen - Germany. - Reimbursement of social security contributions. - Case 104-76.