Long slit spectroscopy of a sample of isolated spirals with and without an AGN I. Márquez, F. Durret, J. Masegosa, M. Moles, J. Varela, R. M. González Delgado, J. Maza, E. Pérez and M. Roth A&A, 416 2 (2004) 475-498 Published online: 27 February 2004 DOI: 10.1051/0004-6361:20034108