FIRDAUS, A.; YUDOKO, G. . Lean Six Sigma Improvement for Reducing Material Storage in Underground Mine at PT Freeport Indonesia. Advances In Social Humanities Research, [S. l.], v. 4, n. 9, p. 1187–1205, 2026. DOI: 10.46799/adv.v4i9.664. Disponível em: https://adshr.org/index.php/vo/article/view/664. Acesso em: 28 sep. 2026.