HANSEN, S. . Investment Grade Energy Audits. Distributed Generation & Alternative Energy Journal, [S. l.], v. 14, n. 3, p. 63–70, 1999. DOI: 10.13052/dgaej2156-3306.1437. Disponível em: https://journals.riverpublishers.com/index.php/DGAEJ/article/view/14687. Acesso em: 14 may. 2026.