Analisis Kewajiban Menetapkan Pengendali bagi Perusahaan Terbuka dalam Rangka Perlindungan terhadap Investor (Studi Perbandingan antara Indonesia, Singapura, dan Amerika Serikat) = Analysis of the Obligation to Assign a Controlling Public Company in the Framework of Protecting Investors (Comparative Study of Controlling Shareholder in Indonesia, Singapore, and United States)