Aliamran, Suryadi, and Karnadi. “Determination of Optimal Sand Material Selection for Sand Moulding Using DMAIC Method: Indonesia”. JIeTri : Journal of Industrial Engineering Tridinanti 1, no. 02 (December 5, 2023): 01–08. Accessed October 5, 2024. https://ejournal.univ-tridinanti.ac.id/index.php/Jietri/article/view/179.