Chin CH, Abdullah S, Singh SSK, Ariffin AK, Schramm D. Bump Energy for Durability Prediction of Coil Spring Based on Local Regularity Analysis. IJIE. 2020;12(5):12-19. Accessed July 22, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5671