MCGOWAN, J. J. . DDC Open Systems-An Overview. Strategic Planning for Energy and the Environment, [S. l.], v. 18, n. 2, p. 6–15, 2023. Disponível em: https://journals.riverpublishers.com/index.php/SPEE/article/view/20615. Acesso em: 23 may. 2026.