Meta-analyses of age–cognition relations in adulthood: Estimates of linear and nonlinear age effects and structural models
Psychological Bulletin (1997) - Comment
doi: 10.1037/0033-2909.122.3.231  issn: 1939-1455  issn: 0033-2909  pubmed: 9354147 

Paul Verhaeghen, Timothy A. Salthouse