http://www.tax.mpg.de/files/pdf1/pensions-tokyo-neu.pdf (Any fulltext)
Konrad, K. A., & Wagner, G. (2002). Reform of the public pension system in Germany. In T. Ihori, & T. Tachibanaki (Eds.), Social Security Reform in Advanced Countries: Evaluating Pension Finance (pp. 188-205). London: Routledge.