1
Published: 2005
Superior document: Enthalten in The Cambridge handbook of age and ageing ; ed. by Malcolm L. Johnson ... Cambridge [u.a.], 2005 S. 394 - 400
2
Published: 2006.
3
Published: 2008.
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4
Published: 2010.
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5
Published: 2012.
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6
Published: 2010,, c2001.
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