1
出版: 1990
Superior document: Enthalten in Issues in the economics of aging Chicago, Ill. [u.a.], 1990 S. 13 - 32
2
出版: 1990
Superior document: Enthalten in Issues in the economics of aging Chicago, Ill. [u.a.], 1990 S. 205 - 229
3
出版: 1989
4
出版: 2009
Superior document: Working paper series / National Bureau of Economic Research 14647
Links: 獲取全文
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7
出版: 2005