Pengaruh corporate governance terhadap reaksi investor di sekitar pengumuman seasoned equity offerings : studi empiris pada perusahaan yang melakukan pengumuman seasoned equity offerings di Bursa Efek Indonesia pada tahun 2006-2010 = The effect of corporate fovernance on investor reaction around the announcement of seasoned equity offerings : empirical studies on companies that make an announcement of seasoned equity offerings in Indonesia Stock Exchange in the period 2006-2010