1
Published: 1990
Superior document: Enthalten in Issues in the economics of aging Chicago, Ill. [u.a.], 1990 S. 173 - 204
2
Published: 2005
Superior document: Enthalten in Analyses in the economics of aging ; ed. by David Wise Chicago, Ill., 2005 S. 79 - 128 National Bureau of Economic Research conference report