1. Antolín, P. et al. (2009), "Investment Regulations and Defined Contribution Pensions", OECD Working Papers on Insurance and Private Pensions, No. 37, OECD publishing.
5. Golinowska, Stanislawa and Maciej Zukowski(2002), “Transformation of Old-Age Security in Poland,” in Schmähl, Winfried and Horstmann, Sabine ed., Transformation of Pension Systems in Central and Eastern Europe, Cheltenham, England : Edward Elgar.