Sattraburut, Thunyapat, Yupa Thasod, Benjavun Ratanasthien, and Sirasit Vongvassana. “Spore Color Index Study of the Hongsa Sediments, Lao PDR: Implications for Thermal Maturity and Paleoenvironment”. Tropical Natural History 25, no. 1 (July 16, 2025): 57–71. accessed August 31, 2026. https://li01.tci-thaijo.org/index.php/tnh/article/view/263693.