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              Weiss, Robert S.; Bass, Scott A. (2002): Introduction. In: Weiss, Robert S.; Bass, Scott A. (Hrsg.): Challenges of the Third Age: Meaning and Purpose in Later Life, Oxford: Oxford University Press, S. 3-12.
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              Weiss, Robert S.; Bass, Scott A. 2002: Introduction. In: Weiss, Robert S.; Bass, Scott A. (Hg.): Challenges of the third age. Meaning and purpose in later life. Oxford [England], New York: Oxford University Press: 3-12.
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