NOWICKI, Maciej. From the Polish Minister of Environment. Problemy Ekorozwoju / Problems of Sustainable Development, [S. l.], v. 4, n. 1, p. 9–10, 2009. Disponível em: https://ph.pollub.pl/index.php/preko/article/view/4706. Acesso em: 15 dec. 2025.