Kristiawan, Ruben Bayu, et al. “Thermal and Flame Retardant Performance of Glass Fiber-Reinforced UPR Composites Modified With Boric Acid and Sodium Silicate”. Jurnal Teknik Mesin (Journal Of Mechanical Engineering), vol. 14, no. 2, June 2025, pp. 150-6, doi:10.22441/jtm.v14i2.33580.