Batubara, David Perkasa, and Juliana Rouli. 2024. “Process Improvement Analysis in Toll Corridor Development With Lean Six Sigma Approach: Case in PT Jasamarga Related Business”. Operations Excellence: Journal of Applied Industrial Engineering 15 (3). Jakarta, Indonesia:274-84. https://doi.org/10.22441/oe.2023.v15.i3.093.