SHRINGI, S.; MISHRA, M. K.; SINGH, A. K. To study 6MWT as a prognostic marker in stable COPD patients & its correlation with spirometry grading. Pakistan Journal of Chest Medicine, [S. l.], v. 26, n. 4, p. 187–193, 2021. Disponível em: http://www.pjcm.net/index.php/pjcm/article/view/670. Acesso em: 17 apr. 2026.