“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, vol. 1, no. 5, July 2019, https://doi.org/10.15408/jlr.v1i5.12178.