Pawełek, Barbara. “A Comparative Analysis of the European Union Member States in Terms of Public Spending on Environmental Protection in 2004-2017”. European Journal of Government and Economics 9, no. 1 (May 28, 2020): 95-114. Accessed August 9, 2020. https://revistas.udc.es/index.php/ejge/article/view/ejge.2020.9.1.5847.