Classification of EUV stellar sources detected by the ROSAT WFC - I. Photometric and radial velocity studiesG. Cutispoto, L. Pastori, G. Tagliaferri, S. Messina and R. PallaviciniAstron. Astrophys. Suppl. Ser., 138 1 (1999) 87-99DOI: https://doi.org/10.1051/aas:1999497