Sandora, Rina, and Syirva Maulidya. “Analysis of Ovality Deviation of Bending Superheater Tube Boiler Fabrication Process With Six Sigma Method in Manufacturing Company”. Tibuana 7, no. 2 (July 28, 2024): 98–106. Accessed January 15, 2025. https://jurnal.unipasby.ac.id/index.php/tibuana/article/view/9355.