ØSTERGAARD, P. A.; SOARES, I.; FERREIRA, P. Energy efficiency and renewable energy systems in Portugal and Brazil. International Journal of Sustainable Energy Planning and Management, Aalborg, Denmark, v. 2, p. 1–6, 2014. DOI: 10.5278/ijsepm.2014.2.1. Disponível em: https://journals.aau.dk/index.php/sepm/article/view/567. Acesso em: 3 oct. 2022.