S. Sukirno, Cleo, and Devan, “Sulphurization of Kapok (Ceiba Pentandra ) Seed Oil via H2S Bubbling Under UV Radiation and The Product’s Performance as Extreme Pressure Additives for Lubricant”, ASEAN J. Chem. Eng., vol. 24, no. 3, pp. 365-372, Dec. 2024.