T. Sattraburut, Y. Thasod, B. Ratanasthien, and W. Kandharosa, “PETROGRAPHIC AND CHEMICAL CHARACTERI-ZATIONS OF COALS FROM HONGSA COAL MINE, XAYABOULY PROVINCE, LAO PDR”, Suranaree J Sci Technol, vol. 28, no. 1, pp. 030037(1–11), Aug. 2026.