Nasution , A. Y., M. R. Mat Rejab, and J. P. Siregar. “Effect of Adding a Trigger Hole and Cross-Section Foam on the Crash Box in Energy Absorption”. Environment-Behaviour Proceedings Journal, vol. 10, no. SI42, Jan. 2026, https://ebpj.e-iph.co.uk/index.php/EBProceedings/article/view/7750.