PTAK, Michał. Directions of Changes in the Functioning of Economic Instruments for Environmental Policy in Poland. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy, [S. l.], v. 5, n. 2, p. 129–140, 2010. DOI: 10.12775/EQUIL.2010.030. Disponível em: https://apcz.umk.pl/EQUIL/article/view/EQUIL.2010.030. Acesso em: 8 jul. 2025.