"Sozialversicherungsfinanzierung" . . "United States Committee on Ways and Means" . . . . "Gesetzliche Rentenversicherung" . . . . . . . . . . "The future of Social Security : hearing before the Committee on Ways and Means, US House of Representatives, One Hundred Ninth Congress, first session, March 9, 2005" . "Öffentliche Sozialausgaben" . . "USA" . . "Prognose" . .