National economy energy efficiency conceptual principles. Economics and region, [S. l.], n. 3(74), p. 13–18, 2019. DOI: 10.26906/eip.2019.3(74).1755. Disponível em: https://ojs35.nupp.edu.ua/eir/article/view/1755. Acesso em: 10 feb. 2026.