The distribution of ionized gas in early-type galaxies. II. The velocity field of the ionized gasW. W. Zeilinger, A. Pizzella, P. Amico, G. Bertin, F. Bertola, L. M. Buson, I. J. Danziger, H. Dejonghe, E. M. Sadler, R. P. Saglia and P. T. de ZeeuwAstron. Astrophys. Suppl. Ser., 120 2 (1996) 257-266DOI: https://doi.org/10.1051/aas:1996290