High resolution THz gas spectrometer based on semiconductor and superconductor devices V. Anfertev, V. Vaks, L. Revin, I. Pentin, I. Tretyakov and G. Goltsman EPJ Web Conf., 132 (2017) 02001 Published online: 13 December 2016 DOI: 10.1051/epjconf/201713202001