tunik tunik, Niningasih R, Yuswantoro E. The Effectiveness of Breath Relaxation with Balloon Blowing Technique towards Oxygen Saturation of COPD Patients. JPK [Internet]. 2020Oct.25 [cited 2025Nov.5];9(2):193-9. Available from: https://ojs.poltekkes-malang.ac.id/jpk/article/view/2031