Darmawan R, Susetyo B. IMPROVING THE QUALITY OF WORK ON CULVERT UNDERPASS BOX STRUCTURES USING THE LEAN SIX SIGMA METHOD. jpensil [Internet]. 2025 Jan. 31 [cited 2025 Feb. 2];14(1):1-19. Available from: https://journal.unj.ac.id/unj/index.php/jpensil/article/view/45230