Cupu, D.R.P. et al. 2026. Friction performance of palm oil-based trimethylolpropane ester containing bacterial cellulose and sorbitan monostearate: A Taguchi-based study. Teknomekanik. 9, 3 (Oct. 2026), 361–377. DOI:https://doi.org/10.24036/teknomekanik.v9i3.59272.