DUŢU, M. Strategic energy sources and trends of alternative energies in the European Union. Annals of Spiru Haret University. Economic Series , [S. l.], v. 9, n. 1, p. 109–116, 2016. Disponível em: https://anale.spiruharet.ro/economics/article/view/9110. Acesso em: 5 may. 2024.