Fathurohman DMH, Purba HH, Trimarjoko A. Value Stream Mapping and Six Sigma Methods to Improve Service Quality at Automotive Services in indonesia. Oper. Res. Eng. Sci. Theor. Appl. [Internet]. 2021 Jun. 24 [cited 2024 Nov. 22];4(2):36-54. Available from: https://oresta.org/menu-script/index.php/oresta/article/view/87