A. R. Swethaa, A. A. Salim, A. A. N. Reddy, C. D. Ankitha, and A. Bhardwaj, “Low-Cost Respiratory Aid for Chronic Obstructive Pulmonary Disease (COPD)”, IJRESM, vol. 8, no. 4, pp. 1–5, Apr. 2025, Accessed: Apr. 19, 2025. [Online]. Available: https://journal.ijresm.com/index.php/ijresm/article/view/3240