Kris Witono, Lisa Agustriyana, and Sugeng Hadi Susilo. “Optimizing Flexibility in SUP9 Leaf Springs: The Synergistic Effect of Tempering Temperature and Holding Time”. Asian Journal Science and Engineering 4, no. 1 (June 30, 2025): 25–3`1. Accessed April 17, 2026. https://attractivejournal.com/index.php/ajse/article/view/1886.