Optical spectroscopy of galaxies in the direction of the Virgo cluster G. Gavazzi, C. Bonfanti, P. Pedotti, A. Boselli and L. Carrasco Astron. Astrophys. Suppl. Ser., 146 2 (2000) 259-265 Published online: 15 October 2000 DOI: 10.1051/aas:2000270