Esmaili, H., Bornak, R. ., Shahrokhi, A. ., & Jadidi, H. . (2024). Improving production efficiency by implementing DMAIC phases on the Six Sigma method: a case study on the oil industry. International Journal of Industrial Chemistry, 15(4), 1-26. https://doi.org/10.57647/j.ijic.2024.1504.23