Masetti, NSbarufatti, BParisi, PJimenez-Bailon, EChavushyan, VVogt, FredericSguera, VPalazzi, EBassani, LoredanaGalaz, G.Minniti, D2015-12-130004-6361http://hdl.handle.net/1885/75530The optical spectroscopic followup of 27 sources belonging to a sample of 30 high-energy objects selected by positionally cross correlating the first Fermi/LAT Catalog and the ROSAT All-Sky Survey Bright Source Catalog is presented here. It has been foundBL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects201310.1051/0004-6361/2013226112015-12-11