The AMIGA project - I. Optical characterization of the CIG catalog L. Verdes-Montenegro, J. Sulentic, U. Lisenfeld, S. Leon, D. Espada, E. Garcia, J. Sabater and S. Verley A&A, 436 2 (2005) 443-455 Published online: 30 May 2005 DOI: 10.1051/0004-6361:20042280