- Heribert Engstler & Tobias Wolf & Andreas Motel-Klingbiel, 2011. "Die Einkommenssituation und -entwicklung Verwitweter in Deutschland," Vierteljahrshefte zur Wirtschaftsforschung / Quarterly Journal of Economic Research, DIW Berlin, German Institute for Economic Research, vol. 80(4), pages 77-102.
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