SIHOMBING, I. U. A.; PULUNGAN, R. M.; KARIMA, U. Q.; PRISTYA, T. Y.; SOETRISNO, A. B.; MONTAIN, M. M. Determinants of exacerbations in patients with chronic obstructive pulmonary disease: retrospective cohort study. BKM Public Health and Community Medicine, v. 38, n. 02, p. 49-54, 28 Feb. 2022.