FACILITY OF BIOGAS PRODUCTION IN LATVIA. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 46–51, 2007. DOI: 10.17770/etr2007vol1.1717. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3649.. Acesso em: 11 mar. 2026.