Kaewsri, Teerapath, Kanyaphat Khiewsang, Supatida Pantaweesak, Sajee Jananan, and Sunee Pongpinigpinyo. “Breathing Exercise Application for Enhancing Lung Function Performance in Chronic Obstructive Pulmonary Disease”. KKU Science Journal 52, no. 2 (May 1, 2024): 135–145. accessed October 9, 2026. https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/255940.