Lawanwadeekul, S., P. . Torkittikul, S. . Mulinta, T. . Khunyotying, W. . Tasang, and M. . Bunma. “Effect of Size and Amount of Lightweight Expanded Clay Aggregate on Normal Incidence Sound Absorption Coefficient of Concrete”. Engineering and Applied Science Research, vol. 50, no. 3, May 2023, pp. 195-01, https://ph01.tci-thaijo.org/index.php/easr/article/view/250823.