Role of tiotropium in chronic obstructive pulmonary disease exacerbation. Journal of Institute of Medicine Nepal, [S. l.], v. 32, n. 2, p. 5–10, 2011. DOI: 10.3126/jiom.v32i2.4937. Disponível em: https://nepjol.info/index.php/JIOM/article/view/4937. Acesso em: 7 jul. 2026.