Koalisi dalam sistem presidensial multipartai: studi kasus proses pembahasan kebijakan kenaikan harga jual bahan bakar minyak (BBM) bersubsidi dalam anggaran pendapatan dan belanja negara-perubahan (APBN-P) tahun anggaran 2012 pada masa pemerintahan presiden Susilo Bambang Yudhoyono = Coalition within the multiparty presidential system: case study of the process of deliberation concerning the policy to raise the selling price of subsidized fuel oil in the revised annual state budget of the 2012 fiscal year during president Susilo Bambang Yudhoyono's administration