Dermish أ., Shaneb ع., Elamin ف., and Abugeddida ر. “Improving The Performance of The Production Process Using Six Sigma Methodology. A Case Study at The Libyan Iron and Steel Company”. Journal of Pure & Applied Sciences, vol. 23, no. 2, Oct. 2024, pp. 100-12, doi:10.51984/jopas.v23i2.3065.