Accretion: the gold mine opens. Commentary on: Shakura N. I. and Sunyaev R. A., 1973, A&A, 24, 337 King, A. Abstract Publication: Astronomy and Astrophysics Pub Date: June 2009 DOI: 10.1051/0004-6361/200912147 Bibcode: 2009A&A...500...53K