Wanprestasi oleh pemenang lelang dalam pelaksanaan lelang pada balai lelang swasta (studi kasus lBlD-PT. Balai Lelang Serasi Pekanbaru) = Tort by winning bidders of auctions conducted by a private auction house a (case study lBlD PT. Balai Lelang Serasi Pekanbaru) / Mutia Ariani