Khempila, J. and แก้วพรม จ. . (2022) “Development of Thermal Insulators Made from Elephant Grass and Eggshell”, Rattanakosin Journal of Science and Technology, 4(3), pp. 1–11. available at: https://ph02.tci-thaijo.org/index.php/RJST/article/view/246249 (accessed: 9 December 2025).