Journal Article
Smith, J.,
Maas, I.,
Mayer, K. U.,
Helmchen, H.,
Steinhagen-Thiessen, E., &
Baltes, P. B. (2002). Two-wave longitudinal findings from the Berlin Aging Study: Introduction to a collection of articles.
The Journals of Gerontology: B, Psychological Sciences and Social Sciences,
57B(6), P471–P473. https://doi.org/10.1093/geronb/57.6.P471