Hartana, Hartana. “IMPLICATION OF GROUP COMPANY EXPANSION TO MONOPOLY PRCTICE AND UNFAIR BUSINESS COMPETITION (Study Case : Coal Mining Industry)”. Jurnal Komunikasi Hukum (JKH) 6, no. 1 (April 30, 2020): 161–175. Accessed December 5, 2024. https://ejournal.undiksha.ac.id/index.php/jkh/article/view/23467.