“Application of Lean Six Sigma Approach to Reduce Worker Fatigue in Racking Areas Using DMAIC, VSM, FMEA and ProModel Simulation Methods in Sub Logistic Companies: A Case Study of Indonesia” (2021) International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135), 7(6), pp. 1–11. doi:10.31695/IJERAT.2021.3716.