Friksi pendanaan dan subtitusi antara pendanaan internal & eksternal pada Perusahaan Constrained dan Unconstrained periode 2006-2010 = Financing frictions and the subtitutions between internal and external funds at Constrained and Unconstrained Firms in 2006-2010 (Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012)