VAN DEN BERG, A J. COPD - is one exacerbation enough?. African Journal of Thoracic and Critical Care Medicine, [S. l.], v. 29, n. 3, p. 142, 2023. Disponível em: https://samajournals.co.za/index.php/ajtccm/article/view/1497. Acesso em: 12 nov. 2025.