GRUPČE, L. Pig and poultry farms as self-regulated biotechnology systems - a fundamental approach to environmental preservation. Macedonian Journal of Ecology and Environment, [S. l.], v. 2, n. 2, p. 51–58, 1994. Disponível em: https://mjee.org.mk/index.php/mjee/article/view/23. Acesso em: 6 may. 2024.