Hartana, H. 2020. IMPLICATION OF GROUP COMPANY EXPANSION TO MONOPOLY PRCTICE AND UNFAIR BUSINESS COMPETITION (Study Case : Coal Mining Industry). Jurnal Komunikasi Hukum (JKH). 6, 1 (Apr. 2020), 161–175. DOI:https://doi.org/10.23887/jkh.v6i1.23467.