Effectiveness of the 4-7-8 Breathing Technique in Enhancing Sleep Quality for COPD Patients. Jurnal Respirologi Indonesia, [S. l.], v. 45, n. 4, p. 267–271, 2025. DOI: 10.36497/jri.v45i4.948. Disponível em: http://www.jurnalrespirologi.org/index.php/jri/article/view/948. Acesso em: 18 dec. 2025.