UDDIN, SM Afzal et al. A Study of Echocardiographic Changes Among the Patients of COPD. TAJ: Journal of Teachers Association, [S. l.], v. 28, n. 1, p. 16–20, 2018. DOI: 10.3329/taj.v28i1.39062. Disponível em: https://banglajol.info/index.php/TAJ/article/view/39062. Acesso em: 4 sep. 2025.