Hartana H. Regulation of Group Company Expansion Restrictions in the Coal Mining Sector Viewed from Indonesian Laws and Regulations. J. Komun. Huk. [Internet]. 2021 Sep. 23 [cited 2025 Feb. 22];7(2):520-6. Available from: https://ejournal.undiksha.ac.id/index.php/jkh/article/view/37983