Thongprapha, T., K. Fuenkajorn, and J. J. Daemen. “Study of Surface Subsidence Due to Underground Opening under Super-Critical Condition Using Trap Door Apparatus”. Science & Technology Asia, vol. 20, no. 2, June 2015, pp. 53-62, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/35790.