Carin, Sofjan KN, Alden, Gilbert K, Phangestu W, Maheswari H. A Structured Approach to Improve Production Process Performance in Operations of Coal Mining Business. JIS [Internet]. 2025Dec.31 [cited 2026Jan.2];8(2):126-3. Available from: http://114.7.153.31/index.php/jis/article/view/11631