NIEWDANA, Agnieszka; KAPKOWSKI, Maciej. PET – A Problem on a Global Scale. No Limits, [S. l.], n. 2(4), p. 14–17, 2021. DOI: 10.31261/no_limits.2021.4.04. Disponível em: https://trrest.vot.pl/ojsus/index.php/no_limits/article/view/12615. Acesso em: 30 jun. 2025.