Spectroscopy and BVIC photometry of the young open cluster NGC 6604 R. Barbon, G. Carraro, U. Munari, T. Zwitter and L. Tomasella Astron. Astrophys. Suppl. Ser., 144 3 (2000) 451-456 Published online: 15 June 2000 DOI: 10.1051/aas:2000193