Wakhidah, Delia Hani, et al. “Crashworthiness Performance of Circular Hybrid Crash Box With Friction Model Due to Axial Load”. International Journal of Integrated Engineering, vol. 16, no. 2, May 2024, pp. 182-94, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/16169.