Kompa, Krzysztof, and Dorota Witkowska. “Performance of Pension Funds and Stable Growth Open Investment Funds During the Changes in the Polish Retirement System”. Dynamic Econometric Models 16, no. 1 (December 29, 2016): 117–131. Accessed April 19, 2024. https://apcz.umk.pl/DEM/article/view/DEM.2016.007.