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Welfare Dependence: Concepts, Measures, and Trends.
Gottschalk, Peter, (1994)
Earnings Inequality, the Spatial Concentration of Poverty, and the Underclass.
Danziger, Sheldon, (1987)
Differences in Wage Growth by Education Level: Do Less-Educated Workers Gain Less from Work Experience?
Connolly, Helen, (2006)