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EUR-Lex -  61987CC0368 - EN - Opinion of Mr Advocate General Jacobs delivered on 22 February 1989. - Lieselotte Hartmann Troiani v Landesversicherungsanstalt Rheinprovinz. - Reference for a preliminary ruling: Bundessozialgericht - Germany. - Retroactive payment of voluntary pension-insurance contributions. - Case 368/87.