Analisis yuridis potensi kartel dalam kesepakatan indonesian palm oil pledge (IPOP) berdasarkan pasal 11 undang-undang nomor 5 tahun 1999 tentang larangan praktek monopoli dan persaingan usaha tidak sehat = Juridical analysis regarding the possibility of cartel in indonesian palm oil pledge (IPOP) agreement as regulates under article 11 of law number 5 year 1999 regarding prohibition of anti monopoly and unfair business competition