ปราโมทย์ พ., and พัฒนะอิ่ม ณ. “A study of membrane geometric using acoustic wave (theoretical and experimental analysis)”. Frontiers in Engineering Innovation Research, vol. 7, Dec. 2009, pp. 40-43, https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242189.