Mika, Tatjana / Rehfeld, Uwe / Stegmann, Michael (2009): Provisions for old age. Income provisions and retirement. RatSWD Working Paper Series 112, Berlin: Council for Social and Economic Data (RatSWD).
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. (2009). Provisions for old age. Income provisions and retirement. Berlin: Council for Social and Economic Data (RatSWD. RatSWD Working Paper Series 112.
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