Tinjauan yuridis kewajiban serah terima unit satuan rumah susun dalam perjanjian pengikatan jual beli terhadap putusan pailit pengembang (studi kasus putusan MA no. 236/K/PDT.SUS/2010) = Overview the obligation handover unit of apartment in the sale and purchase agreement against verdict developer on bankrupty (study case no. 236/K/PDT.SUS/2010)