Azwir, Hery Hamdi, Zaenal Fanani, and Hirawati Oemar. “Application of The DMAIC Method in Improving The Quality of Electric Power Steering Housing Products”. Spektrum Industri 20, no. 1 (April 20, 2022): 67–78. Accessed April 27, 2024. https://journal3.uad.ac.id/index.php/spektrum/article/view/16.