Tanggung Jawab Notaris/PPAT Terhadap Objek Jual Beli Berantai Milik Pihak yang Tidak Tercatat dalam Sertipikat Tanah (Studi Putusan Mahkamah Agung No. 485/K/Pdt 2018) = The Responsibility of Notary Public/PPAT Against the Sale and Purchase Object With a Chain Belongs to Parties That Is Not Registered in the Land Certificate (Case Study Supreme Court Decision Number 485/K/Pdt 2018)