Isranuri, Ikhwansyah, Jepri Adan Silalahi, Basuki Wirjosentono, and Warman . “Development of Drum Brake Pad Material Motorcycle Based Composite Hazelnut Shells, Aluminum and Pineapple Leaf Fibers With Polyurethane Matrix”. International Journal of Engineering & Technology 8, no. 1.1 (January 24, 2019): 6–12. Accessed May 5, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/24774.