CUNHA, J.; FERREIRA, P. V. Designing electricity generation portfolios using the mean-variance approach. International Journal of Sustainable Energy Planning and Management, Aalborg, Denmark, v. 4, p. 17–30, 2015. DOI: 10.5278/ijsepm.2014.4.3. Disponível em: https://journals.aau.dk/index.php/sepm/article/view/562. Acesso em: 4 may. 2024.