Wulandari, Ratna Ayu, Heru Prastawa, and Wiwik Budiawan. 2024. “Quality Improvement of The Public Service of The Metal Contamination Testing Laboratory Using Lean Six Sigma Approach (Case Study)”. Formosa Journal of Science and Technology 3 (4):861-80. https://doi.org/10.55927/fjst.v3i4.9205.