Analisis terhadap Kesamaan Dokumen/Surat dalam Perkara Persekongkolan Tender berdasarkan Hukum Persaingan Usaha (Studi terhadap Putusan Mahkamah Agung No. 897 K/Pdt.Sus/2012) = Analysis of Similiarity of Document/Letter in Bid Rigging Based on Competition Law (Studies of Supreme Court Decision. 897 K/Pdt.Sus/2012)