Sucipto, T. A. (2019) “Measurement of Friction Coefficient between Glass and Rubik’s Beam on the Sloping Field using Rubik Lubricant”, Journal of Natural Sciences and Mathematics Research, 5(1), pp. 7–9. Available at: https://journal.walisongo.ac.id/index.php/JNSMR/article/view/11023 (Accessed: 7 June 2025).