Syarifudin A, Arthawati SN, Wirawati SM, Gautama P. Quality Control of PCC (Portland Composite Cement) Using the Six Sigma Method at PT. XY. jiemar [Internet]. 2026May30 [cited 2026Jul.15];7(3):28-7. Available from: https://mail.jiemar.org/index.php/jiemar/article/view/709