ENVIRONMENTALLY SUSTAINABLE TECHNOLOGIES AND ENVIRONMENTAL QUALITY INDICATORS. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 122–127, 2001. DOI: 10.17770/etr2001vol1.1945. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3493.. Acesso em: 11 mar. 2026.