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              Engstler, H., & Schmiade, N. (2013). The German Ageing Survey (DEAS) -A Longitudinal and Time- Series Study of People in the Second Half of Life. Schmollers Jahrbuch, 133(1), 97-107. 10.3790/SCHM.133.1.97.
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              Engstler, H., & Schmiade, N. (2013). The German Ageing Survey (DEAS): A longitudinal and time- series study of people in the second half of life. Schmollers Jahrbuch, 133(1), 97-107. doi: https://doi.org/10.3790/schm.133.1.97
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