Suparno, Moh. Ismail Hamim, and Heru Prasetiawan. 2016. “ANALISIS PENGENDALIAN KUALITAS PRODUKSI BOGIE BARBER S2HD9C MENGGUNAKAN METODE LEAN SIX SIGMA DI PT BARATA INDONESIA (PERSERO) GRESIK”. Journal of Research and Technology 2 (2):32-46. https://doi.org/10.55732/jrt.v2i2.235.