Aspek-aspek hukum perdata internasional pada perkara putusan arbitrase internasional di Indonesia: analisis putusan nomor 144/K/Pdt/2012 dan putusan nomor 175/PDT/2018/PT.DKI = Private international law aspects on international arbitral award cases in Indonesia: analysis of decision number 144/K/Pdt/2012 and decision number 175/PDT/2018/PT.DKI