“Praktik Monopoli PT Perusahaan Gas Negara Di Area Medan; Studi Putusan Terhadap Putusan Mahkamah Agung Nomor 511 K Pdt.Sus KPPU 2018”. JOURNAL of LEGAL RESEARCH 1, no. 5 (July 2, 2019). Accessed January 25, 2026. https://journal.uinjkt.ac.id/jlr/article/view/12178.