Sulistyo R, Soedjarno A, Simatupang TM. Operations Strategy Formulation: Shifting from Grasberg Open-Pit Surface Mining to Underground Mining. Int. res. j. bus. stud. [Internet]. 2011 Apr. 1 [cited 2026 Mar. 7];4(1):21-48. Available from: https://irjbs.prasetiyamulya.ac.id/index.php/jurnalirjbs/article/view/801