Measuring the total factor productivity of the portuguese water and sewerage services. Economia Aplicada, [S. l.], v. 12, n. 2, p. 215–237, 2008. DOI: 10.1590/S1413-80502008000200003. Disponível em: https://www.revistas.usp.br/ecoa/article/view/978.. Acesso em: 3 maio. 2024.