“Efficiency Analysis of Underframe Component Installation Process in the KCI Retrofit Electric Multiple Unit (EMU) Project at PT xxx using a Lean Manufacturing Approach: Analisis Efisiensi Proses Pemasangan Komponen Underframe pada Proyek KRL KCI Retrofit di PT xxx dengan pendekatan Lean Manufacturing”, PELS, vol. 10, no. 1, pp. 1289–1297, Nov. 2026, doi: 10.21070/44edbd30.