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Mathias Kifmann on "Health insurance in a democracy : why is it public and why are premiums income related?"
Richter, Wolfram F., (2007)
The German Retirement Benefit Formula: Drawbacks and Alternatives
Breyer, Friedrich, (2004)
Erhöhung der Regelaltersgrenze oder Kürzung des Rentenniveaus?
Breyer, Friedrich, (1999)