Abadi, Zainal, Andre Kurniawan, Andril Arafat, Nur Abdillah, and Daffa Senthot. “Analysis of Riser Variations in Recycled Aluminum Sand Casting on Hardness Values”. INVOTEK: Jurnal Inovasi Vokasional dan Teknologi 21, no. 3 (October 13, 2021): 213-220. Accessed April 29, 2024. http://invotek.ppj.unp.ac.id/index.php/invotek/article/view/940.