KOMPA, K.; WITKOWSKA, D. Pension Funds in Poland: Efficiency Analysis for Years 1999–2013. Dynamic Econometric Models, [S. l.], v. 14, p. 105–124, 2015. DOI: 10.12775/DEM.2014.006. Disponível em: https://apcz.umk.pl/DEM/article/view/DEM.2014.006. Acesso em: 18 jul. 2024.