Praktik Monopoli PT Perusahaan Gas Negara Di Area Medan; Studi Putusan Terhadap Putusan Mahkamah Agung Nomor 511 K/Pdt.Sus KPPU/2018. (2019). JOURNAL of LEGAL RESEARCH, 1(5). https://doi.org/10.15408/jlr.v1i5.12178