Sudigdo, Destiano, and Margono Sugeng. “Analisis Perbandingan Sifat Mekanik Pegas Daun Baja SUP9 Dan SUP9A Melalui Uji Kekerasan Dan Struktur Mikro”. Jurnal Teknik Mesin 18, no. 2 (December 30, 2025): 165–170. Accessed October 29, 2026. https://ejournal2.pnp.ac.id/index.php/jtm/article/view/1959.