ปราโมทย์ พิพัฒน์, and พัฒนะอิ่ม ณัฐสิทธิ์. “A study of membrane geometric using acoustic wave (theoretical and experimental analysis)”. Frontiers in Engineering Innovation Research 7 (December 30, 2009): 40–43. accessed September 3, 2026. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242189.