Ibrahim, C. J. ., A. N. . Probandari, Y. S. . Susanto, and J. . Aphridasari. “Optimal Intensity of Aerobic Exercise Training for Patient With Chronic Obstructive Pulmonary Disease (COPD): Systematic Review and Meta-Analysis”. Respiratory Science, vol. 3, no. 2, Feb. 2023, pp. 116-31, doi:10.36497/respirsci.v3i2.74.