Emission line AGNs from the REX survey - Results from optical spectroscopyA. Caccianiga, T. Maccacaro, A. Wolter, R. Della Ceca and I. M. GioiaAstron. Astrophys. Suppl. Ser., 144 2 (2000) 247-269DOI: https://doi.org/10.1051/aas:2000344