Boonyarom , O., N. Jansrikhot, B. Somwan, S. Saiyat, S. Somthavil, and R. Sangphong. “Development of abdominal exercise machine”. Chulalongkorn Medical Journal 58, no. 5 (September 7, 2023). accessed September 28, 2026. https://he05.tci-thaijo.org/index.php/CMJ/article/view/671.