Molecular gas in NUclei of GAlaxies (NUGA) - IV. Gravitational torques and AGN feeding S. García-Burillo, F. Combes, E. Schinnerer, F. Boone and L. K. Hunt A&A, 441 3 (2005) 1011-1030 Published online: 23 September 2005 DOI: 10.1051/0004-6361:20052900