Radzuan, Nurul Qastalani, Mohd Hasnun Arif Hassan, Mohd Nadzeri Omar, and Khairil Anwar Abu Kassim. 2024. “The Influence of Helmet Certification in Motorcycle Helmets Protective Performance”. Journal of Mechanical Engineering and Sciences 18 (1):9811-23. https://doi.org/10.15282/jmes.18.1.2024.1.0776.