9Siliverstovs, B., A. KholodilinK, and U. Thiessen. Does Aging Influence Structural Change? Evidence from Panel Data[J]. Economic System, 2011,(35):244-260.
10Verhaeghen, P., and T. A. Salthouse. Meta-analyses of Age-cognition Relations in Adulthood: Estimates of Linear and Nonlinear Age Effects and Structural Models[J]. Psychological Bulletin, 1997,122(3):231-249.