Heavy Metal Content in Substrates in Agricultural Biogas Plants. Agricultural Engineering , [S. l.], v. 27, p. 315–329, 2023. DOI: 10.2478/agriceng-2023-0023. Disponível em: https://ojs.agriceng.org/index.php/AgricEng/article/view/400.. Acesso em: 8 jan. 2025.