Spectroscopy and BVIC photometry of the young open cluster NGC 6604R. Barbon, G. Carraro, U. Munari, T. Zwitter and L. TomasellaAstron. Astrophys. Suppl. Ser., 144 3 (2000) 451-456DOI: https://doi.org/10.1051/aas:2000193