RESEARCHES OF ENVIROMEMT-FRIENDLY TECHNOLOGIES AND MANUFACTURER’S COSTS IN PIG FARMING. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 29–35, 2001. DOI: 10.17770/etr2001vol1.1930. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3508.. Acesso em: 11 mar. 2026.