@misc{Kąsek_Leszek_Sustainability_2008,
 author={Kąsek, Leszek},
 address={Washington},
 howpublished={online},
 year={2008},
 publisher={World Bank},
 title={Sustainability of pension systems in the new EU member states and Croatia : coping with aging challenges and fiscal pressures},
 keywords={system emerytalno-rentowy, emerytura, renta, Unia Europejska},
}