Saryanto, Humiras Hardi Purba, Aris Trimarjoko, and Fuad Fatahillah. 2020. “Quality Improvement of Remanufacturing Lift Arm Using Six Sigma Methods in the Heavy-Duty Industry in Indonesia: A Case Study”. Operational Research in Engineering Sciences: Theory and Applications 3 (2):24-38. https://doi.org/10.31181/oresta2003024s.