High energy blazars spectroscopy with X-Shooter on the VLT
  We present results of observations in the UV to near-IR range for eight blazars, three of which have been recently discovered at Very High Energies (VHE) and five appearing as interesting candidates for VHE {\gamma}-ray detection. We focus in this paper on the search for their redshifts, which are unknown or considered as uncertain. 
Santiago Pita, Paolo Goldoni, Catherine Boisson, Yvonne Becherini,   Lucie G\'erard, Jean-Philippe Lenain and Michael Punch
astro-ph.HE